| Dannella simplex | Larva - nymph | Caucci p. 063 |
| Dannella simplex | Imago - male genitalia | Berner - p. 68 fig. 66 |
| Dannella simplex | Larva - dorsal, mature | Berner - p. 80 fig. 155 |
| Dannella simplex | Larva - nymph | Caucci p. 256+ CP V e |
| Dannella simplex (Ephemerella simplex) | Imago - genitalia | Arbona p. 175 fig. 19 |
| Dannella simplex (Ephemerella simplex) | Imago - genitalia | Leonard p. 126 fig. 76 |
| Dannella simplex (Ephemerella simplex) | Imago - male genitalia | Needham p. 621 a |
| Dannella simplex (Ephemerella simplex) | Larva - nymph | Arbona p. 091 fig. 8-15 |
| Dannella simplex (Ephemerella simplex) | Larva - nymph | Leonard p. 63 fig. 36 |
| Dannella simplex (Ephemerella simplex) | Larva - nymph | Schwiebert p.310b-14 |
| Dannella simplex (Timpanoga simplex) | Larva - nymph | Knopp p. 251 |
| Daphnia | Imago - adult | McCafferty p. 393 fig. 22.08 |
| Daphnia pulex | Ametabolous - lateral view | Bouchard p. 32 fig. 2.92 |
| Dasycorixa | Imago - metaxyphus | Merritt p. 274 fig. 15.25 |
| Dasyhelea | Larva - larva | McCafferty p. 308 fig. 16.42 |
| Dasyhelea | Larva - lateral view | Bouchard p. 175 fig. 13.70 |
| Derallus | Larva - dorsal view | Merritt p. 430 fig. 20.127 |
| Derallus | Larva - 2nd ab. seg. dorsal | Merritt p. 430 fig. 20.128 |
| Derallus (Deralus) | Imago - lateral view | Merritt p. 435 fig. 20.154 |
| Deronectes depressus | Imago - adult | McCafferty p. 217 fig. 13.14 |
| Derovatellus | Larva - frontal projection dorsal | Merritt p. 420 fig. 20.065 |
| Desmona | Larva - lateral view | Merritt p. 324 fig. 17.63 |
| Desmopachria | Imago - dorsal view | Merritt p. 426 fig. 20.100 |
| Despaxia augusta | Larva - abdominal venter | Merritt p. 229 fig. 14.45 |
| Diamesinae | Larva - larva | McCafferty p. 313 fig. 16.50 |
| Diamesinae | Larva - antenna | McCafferty p. 313 fig. 16.51 |
| Diapriidae | Imago - head lateral | McCafferty p. 377 fig. 20.05 |
| Dibolocelus | Imago - ventral view | Merritt p. 435 fig. 20.156 |
| Dibusa angata | Larva - hind leg lateral | Merritt p. 360 fig. 18.75 |
| Dibusa angata | Larva - ab3 dorsal | Merritt p. 361 fig. 18.83 |
| Dibusa angata | Larva - case | Merritt p. 363 fig. 18.94 |
| Dicosmoecus | Adult - lateral | Pobst - p. 50-a |
| Dicosmoecus | Larva - head & thorax dorsal | McCafferty p. 263 fig. 14.66 |
| Dicosmoecus | Larva - case | McCafferty p. 261 fig. 14.58 |
| Dicosmoecus | Larva - metathoracic claw | Merritt p. 367 fig. 18.139 |
| Dicosmoecus | Larva - lateral view | LaFontaine p. 274 |
| Dicosmoecus | Larva - hind leg lateral | Merritt p. 373 fig. 18.181 |
| Dicosmoecus | larva - cased lateral | Pobst - p. 50-b |
| Dicosmoecus | Larva - cased & uncased dorsal | LaFontaine p. 275 - 1a |
| Dicosmoecus | Larva - case | LaFontaine p. 273 - a |
| Dicosmoecus | Larva - cade | Merritt p. 376 fig. 18.197 |
| Dicosmoecus | Larva - ab2 ventral | Merritt p. 373 fig. 18.184 |
| Dicosmoecus | Imago - lateral view | LaFontaine p. 273 - b |
| Dicosmoecus | Imago - wings | Merritt p. 335 fig. 17.126 |
| Dicosmoecus gilvipes | Larva - pronotum dorsal view | Merritt p. 384 fig. 18.273 |
| Dicranopselaphus | Larva - last abd. seg. dorsal | Merritt p. 442 fig. 20.199 |
| Dicranopselaphus | Imago - tarsus apex | Merritt p. 443 fig. 20.203 |
| Dicranopselaphus | Imago - leg | Merritt p. 443 fig. 20.204 |
| Dicranopselaphus | Imago - 4th & 5th tarsal segments | Merritt p. 443 fig. 20.205 |
| Dicranopselaphus (Dicranopselaphos) | Larva - last abd. seg. dorsal | Merritt p. 442 fig. 20.197 |
| Dicranota | Larva - head capsule ventral | Bouchard p. 168 fig. 13.39 |
| Dineutus | Imago - head & pronotum lateral | Merritt p. 414 fig. 20.049 |
| Dineutus | Larva - dorsal view | Bouchard p. 154 fig. 12.32 |
| Dineutus | Larva - dorsal view | Merritt p. 414 fig. 20.046 |
| Dineutus | Larva - head dorsal | Merritt p. 412 fig. 20.043 |
| Dineutus | Larva - last abdominal segs. ventral | Merritt p. 414 fig. 20.047 |
| Dineutus americanus | Imago - dorsal view | Bouchard p. 154 fig. 12.33 |
| Dineutus americanus | Imago - ventral view | Bouchard p. 154 fig. 12.34 |
| Dineutus assimilis | Larva - larva | McCafferty p. CP X fig. 062 |
| Dineutus assimilis | Imago - adult | McCafferty p. CP X fig. 063 |
| Diphetor hageni (Baetis devinctus) | Imago - hind wing | Needham p. 685 e |
| Diphetor hageni (Baetis devinctus) | Imago - male genitalia | Needham p. 688 i |
| Diphetor hageni (Baetis divinctus) | Larva - nymph | Caucci p. 256+ CP XIX e |
| Diphetor hageni (Baetis divinctus) | Subimago - female dun | Caucci p. 256+ CP XXI d |
| Diphetor hageni (Baetis divinctus) | Subimago - male dun | Caucci p. 256+ CP XXI b |
| Diphetor hageni (Baetis divinctus) | Imago - male spinner | Caucci p. 256+ CP XXI f |
| Diphetor hageni (Baetis parvus) | Imago - genitalia | Arbona p. 177 fig. 69 |
| Diphetor hageni (Baetis parvus) | Larva - abdomen | Arbona p. 157 fig. 54 |
| Diphetor hageni (Baetis parvus) | Imago - hind wing | Arbona p. 177 fig. 68 |
| Diplectrona modesta | Larva - pronotum dorsal view | Merritt p. 358 fig. 18.55 |
| Diplectrona modesta | Larva - head ventral | Merritt p. 357 fig. 18.43 |
| Diplectroninae | Larva - abdomen lateral | McCafferty p. 251 fig. 14.21 |
| Diplectroninae | Larva - head ventral | McCafferty p. 251 fig. 14.24 |
| Diploperla duplicata | Larva - mesosternum ventral | Merritt p. 238 fig. 14.98 |
| Dipseudopsinae | Larva - leg | McCafferty p. 248 fig. 14.13 |
| Disonycha | Imago - hind leg | Merritt p. 459 fig. 20.307 |
| Disonycha | Imago - head & pronotum dorsal | Merritt p. 457 fig. 20.304 |
| Diura knowltoni | Larva - head & pronotum dorsal | Merritt p. 238 fig. 14.97 |
| Dixa | Larva - apex of abdomen lateral | Bouchard p. 166 fig. 13.28 |
| Dixa | Larva - larva | McCafferty p. 302 fig. 16.25 |
| Dixa | Larva - larva | Schwiebert p.109-2 |
| Dixa | Pupa - pupa | Schwiebert p.109-3 |
| Dixa modesta | Imago - adult | McCafferty p. 302 fig. 16.27 |
| Dixella | Larva - lateral view | Bouchard p. 177 fig. 13.75 |
| Dixidae (Dixinae) | Larva - abdominal segment dorsal | McCafferty p. 302 fig. 16.26 |
| Doddsia occidentalis | Larva - right cersus lateral | Merritt p. 226 fig. 14.16 |
| Dolania | Imago - head dorsal | Merritt p. 145 fig. 11.106 |
| Dolania | Imago - male genitalia ventral | Merritt p. 145 fig. 11.105 |
| Dolania | Larva - head & fore legs dorsal | Merritt p. 131 fig. 11.08 |
| Dolania americana | Imago - fore wing, male | Berner - p. 56 fig. 14 |
| Dolania americana | Larva - dorsal view | Berner - p. 260 plate 14 |
| Dolania americana | Larva - larva | McCafferty p. 112 fig. 07.41 |
| Dolichopodidae | Pupa - pupa | McCafferty p. 321 fig. 16.79 |
| Dolichopodidae | Imago - wing | McCafferty p. 321 fig. 16.80 |
| Dolichopodidae | Larva - abdomen dorsolateral | McCafferty p. 321 fig. 16.78 |
| Dolomedes | Ametabolous - dorsal view | Bouchard p. 19 fig. 2.44 |
| Dolomedes | Imago - adult female | McCafferty p. 402 fig. 23.07 |
| Dolophilodes | Pupa - head frontal | Merritt p. 330 fig. 17.89 |
| Dolophilodes | Pupa - abdomen dorsal | Merritt p. 330 fig. 17.88 |
| Dolophilodes | Larva - retreat | Merritt p. 311 fig. 17.06 |
| Dolophilodes | Larva - head ventral | Merritt p. 378 fig. 18.217 |
| Dolophilodes | Larva - head & thorax dorsal | Merritt p. 321 fig. 17.52 |
| Dolophilodes | Larva - foretrochantin & prothoracic coxa | Merritt p. 379 fig. 18.222 |
| Dolophilodes | Larva - case | LaFontaine p. 292 - a |
| Dolophilodes | Imago - maxillary palp | Merritt p. 334 fig. 17.114 |
| Dolophilodes | Imago - lateral view | LaFontaine p. 292 - b |
| Dolophilodes | Imago - head, pro & mesonotum dorsal | Merritt p. 334 fig. 17.113 |
| Donacia | Larva - larva | McCafferty p. 233 fig. 13.59 |
| Donacia | Larva - ventral view | Merritt p. 406 fig. 20.014 |
| Donacia | Imago - dorsal view | Merritt p. 457 fig. 20.301 |
| Donacia | Larva - lateral view | Merritt p. 406 fig. 20.013 |
| Donacia palmata | Imago - adult | McCafferty p. CP XI fig. 071 |
| Donacia palmata | Imago - adult | McCafferty p. 365 fig. 18.06 |
| Doroneuria baumanni | Larva - abdominal dorsum | Merritt p. 232 fig. 14.61 |
| Doroneuria baumanni | Larva - basal right cercuss dorsal | Merritt p. 232 fig. 14.60 |
| Dreissena polymorpha | Ametabolous - full view | Bouchard p. 14 fig. 2.14 |
| Dromogomphus | Larva - abdomen apex | Bouchard p. 67 fig. 5.08 |
| Dromogomphus | Larva - antenna | Bouchard p. 69 fig. 5.16b |
| Dromogomphus | Larva - apex of abdomen dorsal | Bouchard p. 43 fig. 3.31 |
| Drunella | Larva - lateral view | Merritt p. 137 fig. 11.41 |
| Drunella | Larva - gill 3, lamella raised | Merritt p. 133 fig. 11.19 |
| Drunella | Larva - foreleg femur | Merritt p. 141 fig. 11.71 |
| Drunella | Imago - genitalia (male) | Merritt p. 153 fig. 11.155 |
| Drunella allegheniensis (Ephemerella allegheniensis) | Larva - dorsal | Needham p. 185 fig. 51 |
| Drunella allegheniensis (Ephemerella allegheniensis) | Larva - nymph | Schwiebert p.310b-2 |
| Drunella allegheniensis (Ephemerella allegheniensis) | Larva - head dorsal | Needham p. 592 e |
| Drunella coloradensis | Larva - abdomen | Arbona p. 160 fig. 105 |
| Drunella coloradensis | Larva - nymph | Knopp p. 241 |
| Drunella coloradensis (Ephemerella coloradensis) | Larva - nymph | Schwiebert p.214b-7 |
| Drunella coloradensis (Ephemerella coloradensis) | Imago - genitalia | Arbona p. 175 fig. 29 |
| Drunella coloradensis (Ephemerella coloradensis) | Larva - nymph | Arbona p. 022 fig. 3-6 |
| Drunella doddsii (Drunella doddsi) | Larva - head | Knopp p. 231 |
| Drunella doddsii (Drunella doddsi) | Larva - nymph | Caucci p. 256+ CP V d |
| Drunella doddsii (Drunella doddsi) | Larva - nymph | Knopp p. 232 |
| Drunella doddsii (Drunella doddsi) | Larva - abdomen | Arbona p. 160 fig. 124 |
| Drunella doddsii (Ephemerella doddsi) | Larva - head dorsal | Needham p. 592 f |
| Drunella doddsii (Ephemerella doddsi) | Larva - nymph | Arbona p. 096 fig. 8-22 |
| Drunella doddsii (Ephemerella doddsi) | Larva - nymph | Schwiebert p.214b-6 |
| Drunella doddsii (Ephemerella doddsi) | Imago - genitalia | Arbona p. 175 fig. 28 |
| Drunella flavilinea | Larva - abdomen | Arbona p. 160 fig. 104 |
| Drunella flavilinea | Larva - abdomen | Knopp p. 239 |
| Drunella flavilinea | Larva - nymph | Knopp p. 174 Plate 1d |
| Drunella flavilinea | Larva - nymph | Knopp p. 238 |
| Drunella flavilinea (Ephemerella flavilinea) | Larva - nymph | Caucci p. 256+ CP IV e |
| Drunella flavilinea (Ephemerella flavilinea) | Larva - nymph | Arbona p. 096 fig. 8-23 |
| Drunella flavilinea (Ephemerella flavilinea) | Subimago - female dun | Swisher p. 122-CP-4b |
| Drunella flavilinea (Ephemerella flavilinea) | Imago - | Swisher p. 122-CP-7d |
| Drunella flavilinea (Ephemerella flavilinea) | Imago - genitalia | Arbona p. 175 fig. 30 |
| Drunella flavilinea (Ephemerella flavilinea) | Imago - male genitalia | Needham p. 597 g |
| Drunella flavilinea (Ephemerella flavilinea) | Larva - head dorsal | Needham p. 592 d |
| Drunella flavilinea (Ephemerella flavilinea) | Larva - nymph | Schwiebert p.310b-4 |
| Drunella grandis grandis | Larva - nymph | Knopp p. 232 |
| Drunella grandis grandis (Drunella grandis) | Larva - larva | McCafferty p. CP III fig. 016 |
| Drunella grandis grandis (Drunella grandis) | Larva - abdomen | Arbona p. 160 fig. 123 |
| Drunella grandis grandis (Drunella grandis) | Subimago - male subimago | McCafferty p. CP III fig. 017 |
| Drunella grandis grandis (Drunella grandis) | Subimago - dun | Knopp p. 174 Plate 3c |
| Drunella grandis grandis (Ephemerella grandis) | Imago - male genitalia | Needham p. 597 a |
| Drunella grandis grandis (Ephemerella grandis) | Larva - head dorsal | Needham p. 592 g |
| Drunella grandis grandis (Ephemerella grandis) | Larva - nymph | Arbona p. 095 fig. 8-21 |
| Drunella grandis grandis (Ephemerella grandis) | Larva - nymph | Schwiebert p.214b-1 |
| Drunella grandis grandis (Ephemerella grandis) | Imago - genitalia | Arbona p. 175 fig. 27 |
| Drunella grandis ingens (Ephemerella glacialis) | Larva - nymph | Caucci p. 256+ CP III d |
| Drunella grandis ingens (Ephemerella glacialis) | Subimago - female dun | Caucci p. 256+ CP III c |
| Drunella grandis ingens (Ephemerella yosemite) | Larva - nymph | Schwiebert p.310b-5 |
| Drunella grandis ingens (Ephemerella yosemite) | Larva - lateral | Needham p. 186 fig. 53 A |
| Drunella lata | Imago - male lateral view | Fauceglia p. 150 |
| Drunella lata | Larva - dorsal view | Fauceglia p. 148 |
| Drunella lata | Larva - abdomen | Arbona p. 160 fig. 126 |
| Drunella lata | larva - dorsal | Ames - p. 118 |
| Drunella lata | Larva - head | Knopp p. 225 |
| Drunella lata | Subimago - female lateral view | Fauceglia p. 150 |
| Drunella lata | Subimago - lateral | Ames - p. 120 |
| Drunella lata | Subimago - male lateral view | Fauceglia p. 149 |
| Drunella lata | Imago - lateral | Ames - p. 122 |
| Drunella lata | Larva - nymph | Knopp p. 226 |
| Drunella lata (Drunella cornuta) | Larva - head | Knopp p. 225 |
| Drunella lata (Drunella cornuta) | Larva - abdomen | Arbona p. 160 fig. 120 |
| Drunella lata (Drunella cornutella) | Larva - abdomen | Arbona p. 160 fig. 125 |
| Drunella lata (Drunella cornutella) | Larva - nymph | Knopp p. 226 |
| Drunella lata (Drunella longicornis) | Larva - abdomen | Arbona p. 160 fig. 121 |
| Drunella lata (Drunella longicornis) | Larva - head | Knopp p. 225 |
| Drunella lata (Drunella longicornis) | Larva - nymph | Knopp p. 226 |
| Drunella lata (Ephemerella cornuta) | Imago - genitalia | Arbona p. 175 fig. 15 |
| Drunella lata (Ephemerella cornuta) | Imago - fore & hind wing | Needham p. 563 |
| Drunella lata (Ephemerella cornuta) | Imago - genitalia | Leonard p. 125 fig. 75 |
| Drunella lata (Ephemerella cornuta) | Larva - male spinner | Caucci p. 256+ CP I e |
| Drunella lata (Ephemerella cornuta) | Larva - nymph | Arbona p. 082 fig. 8-4 |
| Drunella lata (Ephemerella cornuta) | Larva - nymph | Caucci p. 256+ CP I a |
| Drunella lata (Ephemerella cornuta) | Larva - nymph | Leonard p. 48 fig. 27 |
| Drunella lata (Ephemerella cornuta) | Larva - nymph | Schwiebert p.310b-11 |
| Drunella lata (Ephemerella cornuta) | Subimago - male dun | Caucci p. 256+ CP I c |
| Drunella lata (Ephemerella cornutella) | Imago - genitalia | Arbona p. 175 fig. 17 |
| Drunella lata (Ephemerella cornutella) | Imago - male genitalia | Needham p. 597 f |
| Drunella lata (Ephemerella cornutella) | Larva - nymph | Arbona p. 090 fig. 8-13 |
| Drunella lata (Ephemerella lata) | Imago - male spinner | Caucci p. 256+ CP IV f |
| Drunella lata (Ephemerella lata) | Larva - nymph | Schwiebert p.310b-7 |
| Drunella lata (Ephemerella lata) | Subimago - male dun | Caucci p. 256+ CP IV d |
| Drunella lata (Ephemerella lata) | Larva - nymph | Caucci p. 256+ CP IV b |
| Drunella lata (Ephemerella lata) | Larva - nymph | Caucci p. 256+ CP IV a |
| Drunella lata (Ephemerella lata) | Larva - nymph | Leonard p. 43 fig. 23 |
| Drunella lata (Ephemerella lata) | Imago - male genitalia | Needham p. 597 e |
| Drunella lata (Ephemerella lata) | Imago - genitalia | Arbona p. 175 fig. 18 |
| Drunella lata (Ephemerella lata) | Imago - genitalia | Leonard p. 125 fig. 75 |
| Drunella lata (Ephemerella lata) | Imago - male spinner | Leonard p. 44 fig. 24 |
| Drunella lata (Ephemerella lata) | Larva - nymph | Arbona p. 090 fig. 8-14 |
| Drunella lata (Ephemerella longicornis) | Imago - male genitalia | Needham p. 597 c |
| Drunella lata (Ephemerella longicornis) | Larva - fore leg | Needham p. 608 |
| Drunella lata (Ephemerella longicornis) | Larva - head dorsal | Needham p. 592 b |
| Drunella lata (Ephemerella longicornis) | Larva - nymph | Arbona p. 090 fig. 8-12 |
| Drunella lata (Ephemerella longicornis) | Larva - nymph | Schwiebert p.310b-1 |
| Drunella spinifera | Larva - abdomen | Arbona p. 160 fig. 107 |
| Drunella spinifera | Larva - turbecles | Knopp p. 242 |
| Drunella spinifera | Larva - abdomen | Knopp p. 242 |
| Drunella spinifera | Larva - head | Arbona p. 160 fig. 106 |
| Drunella spinifera (Ephemerella spinifera) | Larva - nymph | Arbona p. 097 fig. 8-24 |
| Drunella tuberculata (Ephemerella conestee) | Larva - head dorsal | Needham p. 627 b |
| Drunella tuberculata (Ephemerella tuberculata) | Imago - male genitalia | Needham p. 597 d |
| Drunella tuberculata (Ephemerella tuberculata) | Larva - fore leg | Needham p. 196 fig. 62 F |
| Drunella tuberculata (Ephemerella tuberculata) | Larva - head dorsal | Needham p. 592 h |
| Drunella tuberculata (Ephemerella tuberculata) | Larva - nymph | Schwiebert p.310b-3 |
| Drunella walkeri | Larva - abdomen | Arbona p. 160 fig. 122 |
| Drunella walkeri | Larva - nymph | Knopp p. 226 |
| Drunella walkeri | Larva - head | Knopp p. 225 |
| Drunella walkeri | Larva - nymph | Caucci p. 256+ CP V c |
| Drunella walkeri (Ephemerella fuscata) | Imago - male genitalia | Needham p. 597 b |
| Drunella walkeri (Ephemerella fuscata) | Larva - head dorsal | Needham p. 592 c |
| Drunella walkeri (Ephemerella walkeri) | Larva - nymph | Arbona p. 090 fig. 8-11 |
| Drunella walkeri (Ephemerella walkeri) | Larva - nymph | Leonard p. 46 fig. 26 |
| Drunella walkeri (Ephemerella walkeri) | Imago - genitalia | Leonard p. 125 fig. 75 |
| Drunella walkeri (Ephemerella walkeri) | Imago - genitalia | Arbona p. 175 fig. 16 |
| Drunella walkeri (Ephemerella walkeri) | Imago - fore wing | Leonard p. 45 fig. 25 |
| Drunella walkeri (Ephemerella walkeri) | Larva - nymph | Schwiebert p.214b-7 |
| Drunella walkeri (Ephemerella wayah) | Larva - fore leg | Needham p. 628 |
| Drunella walkeri (Ephemerella wayah) | Larva - head dorsal | Needham p. 627 a |
| Dryopidae | Imago - anterior | McCafferty p. 229 fig. 13.48 |
| Dryops | Imago - dorsal view | Merritt p. 445 fig. 20.224 |
| Dubiraphia | Larva - last abd. segs. ventral | Merritt p. 449 fig. 20.235 |
| Dubiraphia | Imago - maxillary palp | Merritt p. 454 fig. 20.283 |
| Dubiraphia | Imago - pronotum | Merritt p. 454 fig. 20.284 |
| Dyschirus (Dyschirius) | Imago - dorsal view | Merritt p. 409 fig. 20.034b |
| Dysmicohermes | Imago - fore & hind wings | Merritt p. 305 fig. 16.33 |
| Dysmicohermes disjunctus | Larva - segment VIII left spiracle dorsal | Merritt p. 303 fig. 16.31 |
| Dysmicohermes ingens | Larva - segment VIII dorsal | Merritt p. 302 fig. 16.19 |
| Dysmicohermes ingens | Larva - segment VIII left spiracle dorsal | Merritt p. 303 fig. 16.30 |
| Dytiscidae | Larva - terminal abdomonal segments | Bouchard p. 145 fig. 12.7 |
| Dytiscidae | Larva - dorsal view | Bouchard p. 42 fig. 3.24 |
| Dytiscidae | Larva - terminal abd. segs. dorsal | Bouchard p. 46 fig. 3.53 |
| Dytiscinae | Imago - hind leg | McCafferty p. 217 fig. 13.16 |
| Dytiscinae (Hydaticinae) | Imago - hind leg | McCafferty p. 217 fig. 13.18 |
| Dytiscus | Larva - larva | McCafferty p. CP X fig. 061 |
| Dytiscus fasciventris | Imago - adult | McCafferty p. CP X fig. 060 |
| Dytiscus venticalis (Dytiscus verticalis) | Larva - larva | Schwiebert p.118b-2 |
| Dytiscus verticalis | Imago - dorsal view | Bouchard p. 152 fig. 12.29 |