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- About mammals : a guide for children, Sobre los mamíferos : una guía para niños, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- 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
- Sobre los reptiles, una guía para niños, Cathryn Sill ; ilustraciones de John Sill
- About parrots, a guide for children, Cathryn Sill, John Sill
- About habitats, rivers and streams, 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, Sobre los mamíferos : una guía para niños, Cathryn Sill ; illustrated by John Sill ; translated by Cristina de la Torre
- Sobre los anfibios, una guía para niños, Cathryn Sill ; ilustraciones de John Sill
- Sobre los reptiles, una guía para niños, Cathryn Sill ; ilustraciones de John Sill
- About insects, a guide for children, Cathryn Sill ; illustrated by John Sill
- About habitats, rivers and streams, written by Cathryn Sill ; illustrated by John Sill
- About amphibians, a guide for children, Cathryn Sill ; illustrated by John Sill
- About parrots, a guide for children, Cathryn Sill, John Sill