- E-bookThe Amphibians and Reptiles of Michoacán, MéxicoWilliam E. Duellman
- E-bookA Synopsis of Neotropical Hylid Frogs, Genus OsteocephalusWilliam E. Duellman
- E-bookNeotropical Hylid Frogs, Genus SmiliscaWilliam E. Duellman
- E-bookSystematic Status of the Colubrid Snake, Leptodeira discolor GuntherWilliam E. Duellman
- E-bookA Taxonomic Study of the Middle American Snake, Pituophis deppeiWilliam E. Duellman
- E-bookAmphibians and Reptiles of the Rainforests of Southern El Peten, GuatemalaWilliam E. Duellman
- E-bookMiddle American Frogs of the Hyla microcephala GroupWilliam E. Duellman
- E-bookA Review of the Frogs of the Hyla bistincta GroupWilliam E. Duellman
- E-bookThe Genera of Phyllomedusine Frogs (Anura Hylidae)William E. Duellman
- E-bookDescriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, VWilliam E. Duellman
- E-bookSystematic Status of the Colubrid Snake, Leptodeira discolor GuntherWilliam E. Duellman
- E-bookA Review of the Middle American Tree Frogs of the Genus PtychohylaWilliam E. Duellman
- E-bookDescriptions of New Hylid Frogs From Mexico and Central AmericaWilliam E. Duellman
- E-bookA New Subspecies of Lizard, Cnemidophorus sacki, from Michoacan, MexicoWilliam E. Duellman
- E-bookThe Amphibians and Reptiles of Michoacán, MéxicoWilliam E. Duellman
- E-bookA Synopsis of Neotropical Hylid Frogs, Genus OsteocephalusWilliam E. Duellman
- E-bookThe Genera of Phyllomedusine Frogs (Anura Hylidae)William E. Duellman
- E-bookA Distributional Study of the Amphibians of the Isthmus of Tehuantepec, MexicoWilliam E. Duellman
- E-bookDescriptions of Two Species of Frogs, Genus Ptychohyla Studies of American Hylid Frogs, VWilliam E. Duellman