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- Tundras, written by Cathryn Sill ; illustrated by John Sill
- About penguins, a guide for children, Cathryn Sill ; illustrated by John Sill
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill
- Another field guide to little-known & seldom-seen birds of North America, by Ben L. Sill, Cathryn P. Sill, John C. Sill ; illustrations by John C. Sill
- Sobre los insectos, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About fish, a guide for children = Sobre los peces : una guía para niños, Cathryn Sill ; illustrated by / ilustraciones de John Sill ; translated by / traducción de Cristina de la Torre
- About fish, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about fish, written by Cathryn Sill ; illustrated by John C. Sill
- About habitats, forests, written by Cathryn Sill ; illustrated by John Sill
- About habitats, seashores, written by Cathryn Sill ; illustrated by John Sill
- About mollusks, a guide for children, Cathryn Sill ; illustrated by John Sill
- Hand-taming wild birds at the feeder, by Alfred G. Martin ; with photographs and illustrations by the author and with cover art and illustrations by John Sill ; [with a foreword by Stephen W. Kress
- About rodents, a guide for children, Cathryn Sill ; illustrated by John Sill
- About crustaceans, a guide for children, Cathryn Sill ; illustrated by John Sill
- A field guide to little-known & seldom-seen birds of North America, by Ben L. Sill, Cathryn P. Sill, John C. Sill ; illustrations by John C. Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- Sobre los anfibios, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- About fish, a guide for children, Cathryn Sill ; illustrated by John Sill
- About seabirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about birds, written by Cathryn Sill ; illustrated by John Sill
- A guide to bird behavior, Donald W. Stokes ; volume I illustrated by the author with 25 original illustrations by J. Fenwick Lansdowne; volume II illustrated by John Sill, Deborah Prince, and Donald Stokes;volume III illustrated by Bob Hines , with display guides illustrated by Donald W. Stokes
- Curious about mammals, written by Cathryn Sill ; illustrated by John Sill
- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About habitats, oceans, written by Cathryn Sill ; illustrated by John Sill
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- About birds, a guide for children = Sobre los pajaros : una guia para ninos, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre / ilustraciones de John Sill ; traducción de Cristina de la Torre
- About habitats, grasslands, written by Cathryn Sill, illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre = Sobre los mamíferos : una guía para niños / Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About hummingbirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About birds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- A field guide to the birds coloring book, Roger Tory Peterson and Peter Allen ; illustrations by John Sill
- About amphibians, a guide for children = Sobre los anfibios : una guía para niños, Cathryn Sill ; illustrated by John Sill = ilustraciones de John Sill ; translated by Cristina de la Torre = traducción de Cristina de la Torre
- About arachnids, a guide for children, [written by] Cathryn P. Sill ; illustrated by John Sill
- About woodpeckers, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About reptiles, Sobre los reptiles : a guide for children = una guía para niños, Cathryn Sill ; illustrated by/ilustraciones de John Sill ; translated by/traducción de Cristina de la Torre
- About birds, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- About habitats, polar regions, written by Cathryn Sill ; illustrated by John Sill
- About marsupials, a guide for children, Cathryn Sill ; illustrated by John Sill
- About marine mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- Sobre los peces, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About birds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About raptors, a guide for children, Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children = Sobre los insectos : una guía para niños, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre / ilustraciones de John Sill ; traducción de Cristina de la Torre
- Sobre los insectos, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About penguins, a guide for children, Cathryn Sill ; illustrated by John Sill
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill
- Tundras, written by Cathryn Sill ; illustrated by John Sill
- About fish, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about fish, written by Cathryn Sill ; illustrated by John C. Sill
- About fish, a guide for children = Sobre los peces : una guía para niños, Cathryn Sill ; illustrated by / ilustraciones de John Sill ; translated by / traducción de Cristina de la Torre
- About habitats, forests, written by Cathryn Sill ; illustrated by John Sill
- About mollusks, a guide for children, Cathryn Sill ; illustrated by John Sill
- About rodents, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, seashores, written by Cathryn Sill ; illustrated by John Sill
- About crustaceans, a guide for children, Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- Sobre los anfibios, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- About fish, a guide for children, Cathryn Sill ; illustrated by John Sill
- About seabirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about birds, written by Cathryn Sill ; illustrated by John Sill
- Curious about mammals, written by Cathryn Sill ; illustrated by John Sill
- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About habitats, oceans, written by Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- About birds, a guide for children = Sobre los pajaros : una guia para ninos, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre / ilustraciones de John Sill ; traducción de Cristina de la Torre
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre = Sobre los mamíferos : una guía para niños / Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About habitats, grasslands, written by Cathryn Sill, illustrated by John Sill
- About hummingbirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About birds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- A field guide to the birds coloring book, Roger Tory Peterson and Peter Allen ; illustrations by John Sill
- About amphibians, a guide for children = Sobre los anfibios : una guía para niños, Cathryn Sill ; illustrated by John Sill = ilustraciones de John Sill ; translated by Cristina de la Torre = traducción de Cristina de la Torre
- About arachnids, a guide for children, [written by] Cathryn P. Sill ; illustrated by John Sill
- About woodpeckers, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- About marine mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, polar regions, written by Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About reptiles, Sobre los reptiles : a guide for children = una guía para niños, Cathryn Sill ; illustrated by/ilustraciones de John Sill ; translated by/traducción de Cristina de la Torre
- About marsupials, a guide for children, Cathryn Sill ; illustrated by John Sill
- About birds, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- Sobre los peces, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About birds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children = Sobre los insectos : una guía para niños, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre / ilustraciones de John Sill ; traducción de Cristina de la Torre
- About raptors, a guide for children, Cathryn Sill ; illustrated by John Sill