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- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About penguins, a guide for children, Cathryn Sill ; illustrated by John Sill
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- About birds, written by Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill
- About habitats, mountains, written by Cathryn Sill ; illustrated by John Sill
- About penguins, a guide for children, Cathryn Sill ; illustrated by John Sill
- Polar regions, written by Cathryn Sill ; illustrated by John Sill
- About birds, written by Cathryn Sill ; illustrated by John Sill
- About habitats, wetlands, written by Cathryn Sill ; illustrated by John Sill
- About habitats, deserts, written by Cathryn Sill ; illustrated by John Sill