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- Woolly sheep and hungry goats, by Allan Fowler
- El sol siempre brilla en alguna parte, Allan Fowler ; fotografías proporcionades for Fotos VALAN ; versión en español de Aída E. Marcuse
- If it weren't for farmers, by Allan Fowler
- Smart, clean pigs, by Allan Fowler
- Lands of grass, by Allan Fowler
- South America, by Allan Fowler
- Cómo sabes que es primavera?, de Allan Fowler
- The chicken or the egg?, by Allan Fowler
- Antarctica, by Allan Fowler
- Plants that eat animals, by Allan Fowler
- North America, by Allan Fowler
- Simple machines, by Allan Fowler
- North, south, east, and west, by Allan Fowler ; consultants, Robert L. Hillerich, Mary Nalbandian, Fay Robinson
- Lo que escuchas, Allan Fowler ; fotografías proporcionades for Fotos VALAN ; versión en español de Aída E. Marcuse
- What do you see in a cloud?, by Allan Fowler
- Animals under the ground, by Allan Fowler ; consultants, Linda Cornwell, Fay Robinson
- Pine trees, by Allan Fowler
- It could still be a robot, by Allan Fowler
- Lo que ves, Allan Fowler ; fotografías proporcionadas por Fotos VALAN y Jim Whitmer ; versión en español de Aída E. Marcuse
- It's a good thing there are insects, by Allan Fowler ; images supplied by VALAN Photos and Jeffrey L. Rotman ; consultants, Robert L. Hillerich, Mary Nalbandian
- All the colors of the rainbow, by Allan Fowler
- Animals in the zoo, by Allan Fowler
- Caballos, caballos, caballos, por Allan Fowler ; versión en español de Aída E. Marcuse
- Raccoons, by Allan Fowler
- It could still be a cat, by Allan Fowler
- Es mejor dejar en paz a las serpientes, por Allan Fowler ; versión en español de Aída E. Marcuse
- It could still be endangered, by Allan Fowler
- It could still be a flower, by Allan Fowler
- The biggest animal on land, by Allan Fowler
- Australia, by Allan Fowler
- A look at teeth, by Allan Fowler ; consultants, Linda Cornwell, Jan Jenner
- El gusto de las cosas, Allan Fowler ; fotografías proporcionades for Fotos VALAN ; versión en español de Aída E. Marcuse
- Shellfish aren't fish, by Allan Fowler
- From seed to plant, by Allan Fowler ; consultant, Janann V. Jenner
- What magnets can do, by Allan Fowler
- El olor de las cosas, Allan Fowler ; fotografías proporcionades for Fotos VALAN ; versión en español de Aída E. Marcuse
- Stars of the sea, by Allan Fowler
- How do you know it's winter?, by Allan Fowler
- Cougar, lion of the mountains, by Allan Fowler