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- About habitats, grasslands, written by Cathryn Sill ; illustrated by John Sill
- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About marsupials, a guide for children, Cathryn Sill ; illustrated by John Sill
- Seashores, written by Cathryn Sill ; illustrated by John Sill
- Forests, written by Cathryn Sill ; illustrated by John Sill
- About penguins, a guide for children, Cathyrn Sill ; illustrated by John Sill
- About arachnids, a guide for children, Cathryn P. Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill
- About rodents, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- About reptiles, a guide for children, Cathryn Sill ; illustrated by John Sill
- About raptors, a guide for children, Cathryn Sill ; illustrated by John Sill
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- Tundras, written by Cathryn Sill ; illustrated by John Sill
- About habitats, grasslands, written by Cathryn Sill ; illustrated by John Sill
- Forests, written by Cathryn Sill ; illustrated by John Sill
- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- Seashores, written by Cathryn Sill ; illustrated by John Sill
- About rodents, a guide for children, Cathryn Sill ; illustrated by John Sill
- Tundras, written by Cathryn Sill ; illustrated by John Sill
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- Curious about insects, written by Cathryn Sill ; illustrated by John Sill
- About arachnids, a guide for children, Cathryn P. Sill ; illustrated by John Sill
- About mammals, a guide for children, Cathryn Sill ; illustrated by John Sill