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- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- About marine mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About fish, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- Tundras, Cathryn 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
- About hummingbirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About marsupials, a guide for children, Cathryn Sill ; illustrated by John Sill
- Rivers and streams, written by Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- About habitats, oceans, Cathryn Sill ; illustrated by John Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- About marine mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About fish, a guide for children, written by Cathryn Sill ; illustrated by John Sill
- About parrots, a guide for children, Cathryn Sill ; illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- Tundras, Cathryn 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
- About hummingbirds, a guide for children, Cathryn Sill ; illustrated by John Sill
- About marsupials, a guide for children, Cathryn Sill ; illustrated by John Sill
- Rivers and streams, written by Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- About habitats, oceans, Cathryn Sill ; illustrated by John Sill