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- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- Tundras, written by Cathryn P. Sill ; illustrated by John Sill
- Seashores, written by Cathryn Sill ; illustrated by John Sill
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about fish, written by Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- About seabirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- Rivers and streams, written by Cathryn Sill ; illustrated by John Sill
- About crustaceans, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children = Sobre los insectos: una guia para ninos, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- About mollusks, a guide for children, Cathryn Sill ; illustrated by John Sill
- About penguins, a guide for children, Cathryn Sill ; illustrated 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 fish, Sobre los peces : a guide for children = una guía para niños, Cathryn SIll ; illustrated by = ilustraciones de John Sill ; translated by = traducción de Cristina de la Torre
- Sobre los pájaros, 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
- Forests, written by Cathryn Sill ; illustrated by John Sill
- Oceans, written by Cathryn Sill ; illustrated by John Sill
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children = Sobre los mamíferos : una guía para niños, Cathryn Sill ; illustrated by / ilustraciones de John Sill ; translated by / traducción de Cristina de la Torre
- About habitats, grasslands, written by Cathryn Sill, illustrated by John Sill
- About woodpeckers, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- About birds, Sobre los pájaros : a guide for children = una guía para niños, Cathryn Sill ; illustrated by = ilustraciones de John Sill ; translated by = traducción de Cristina de la Torre
- Oceans, written by Cathryn Sill ; illustrated by John Sill
- Curious about mammals, written by Cathryn P. Sill ; illustrated by John Sill
- About fish, a guide for children, Cathryn Sill ; illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- About rodents, a guide for children, Cathryn Sill ; illustrated by John Sill
- About arachnids, a guide for children, Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- About reptiles, a guide for children = Sobre los reptiles : una guía para niños, Cathryn Sill ; illustrated by/ilustraciones de John Sill ; translated by/traducción de Cristina de la Torre
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- About raptors, Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- Curious about birds, written by Cathryn P. Sill ; illustrated by John Sill
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill
- Sobre los mamíferos, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- Tundras, written by Cathryn P. Sill ; illustrated by John Sill
- Seashores, written by Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about fish, written by Cathryn Sill ; illustrated by John Sill
- About seabirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- Rivers and streams, written by Cathryn Sill ; illustrated by John Sill
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- Sobre los pájaros, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- 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 fish, Sobre los peces : a guide for children = una guía para niños, Cathryn SIll ; illustrated by = ilustraciones de John Sill ; translated by = traducción de Cristina de la Torre
- Forests, written by Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children = Sobre los insectos: una guia para ninos, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About mammals, a guide for children = Sobre los mamíferos : una guía para niños, Cathryn Sill ; illustrated by / ilustraciones de John Sill ; translated by / traducción de Cristina de la Torre
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- About habitats, grasslands, written by Cathryn Sill, illustrated by John Sill
- About woodpeckers, a guide for children, Cathryn Sill ; illustrated by John Sill
- About birds, Sobre los pájaros : a guide for children = una guía para niños, Cathryn Sill ; illustrated by = ilustraciones de John Sill ; translated by = traducción de Cristina de la Torre
- Oceans, written by Cathryn Sill ; illustrated by John Sill
- Curious about mammals, written by Cathryn P. Sill ; illustrated by John Sill
- About reptiles, a guide for children = Sobre los reptiles : una guía para niños, Cathryn Sill ; illustrated by/ilustraciones de John Sill ; translated by/traducción de Cristina de la Torre
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about birds, written by Cathryn P. Sill ; illustrated by John Sill
- Sobre los mamíferos, una guía para niños, Cathryn Sill ; ilustraciones de John Sill ; traducción de Cristina de la Torre
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill