• Segmentation: The Annelid Worms (1962)
• Life Story of the Oyster (1963)
• Life Story of the Sea Star (1963)
• Adaptive Radiation: The Mollusks (1961)
• Mollusks (Snails, Mussels, Octopuses, and Their Relatives) (1955)
• Looking at Mammals (1967)
• Learning About Bears (1960)
• Life Story of the Crayfish (1963)
• The Crustaceans (Lobsters, Barnacles, Shrimp, and Their Relatives) (1956)
• The Beaver Family (2nd edition) (1982)
• Mammals Are Interesting (1954)
• Horses! (1978)
• The Great Apes: Fact vs. Fantasy (1977)
• What Is a Mammal? (1962)
• Investigating Hibernation: The Golden-Mantled Ground Squirrel (1972)
• Animals Growing Up (1949)
• Animals Useful to Man (1960)
• Whales: Can They Be Saved? (1976)
• Boy and a Boa (1975)
• Hamsters (1972)
• Guinea Pigs (1972)
• Tadpoles and Frogs (1979)
• Learning About Reptiles (1979)
• Mammals (1979)
• Pigs! (1967)

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