• Regulating Body Temperature (1972)
• Biological Rhythms: Studies in Chronobiology (1977)
• Learning About Cells (1976)
• The Living Cell: DNA (1976)
• The Living Cell: An Introduction (1974)
• Life of a Plant (1950)
• How Pine Trees Reproduce: Pine Cone Biology (1963)
• The Cactus: Profile of a Plant (1973)
• Roots of Plants (1957)
• Human and Animal Beginnings 2 (1988)
• Photosynthesis (1982)
• Seed Germination (1960)
• The Cactus: Adaptations for Survival (1973)
• Diffusion and Osmosis (2nd Edition) (1973)
• Life Story of the Paramecium (1963)
• The First Many-Celled Animals: Sponges (1962)
• Stinging-Celled Animals: Coelenterates (1962)
• Echinoderms: Sea Stars and Their Relatives (1961)
• Biology: Exploring the Living World (1979)
• The Jointed-Legged Animals: Arthropods (1962)
• Food from the Sun (1966)
• Origin of Life (1973)
• Proteins (1973)
• The Energetics of Life (1973)
• The Miracle Months (1978)

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