1. Motorist's Guide to the Going-to-the-Sun Highway (1950 rev.)
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2. Glaciers and Glaciation in Glacier National Park (1952 rev. ed.)
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2. Glaciers and Glaciation in Glacier National Park (1962 reprint)
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3. The Geologic Story of Glacier National Park (1957)
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3. The Geologic Story of Glacier National Park (1971 reprint)
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4. Trees and Forests of Glacier National Park (1956 rev.)
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4. Trees and Forests of Glacier National Park (1961 rev.)
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5. 101 Wildflowers of Glacier National Park (1957)
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5. 101 Wildflowers of Glacier National Park (1967 reprint)
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6. Mammals of Glacier National Park (1955)
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6. Mammals of Glacier National Park (1967 reprint)
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7. Climate of Glacier National Park (1967 rev. ed.)
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8. Through the Years in Glacier National Park (1962 reprint)
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9. Birds of Glacier National Park (1964)
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Animal Tracks of Glacier National Park (1969, rev. ed. 1971, 1975)
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1. Mammals of the Grand Canyon Region (1935)
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2. History and Exploration of the Grand Canyon Region (1935)
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3. Trees of Grand Canyon National Park (1936)
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4. Contributions to Grand Canyon Ornithology (1936)
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5. Contributions to Grand Canyon Geology (1936)
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6. Check-List of Plants of Grand Canyon National Park (1936)
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7. Prehistoric Man in the Southwest (1936)
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8. Check-List of Birds of Grand Canyon National Park (1937)
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9. Amphibians and Reptiles of Grand Canyon National Park (1938)
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10. Plants of Grand Canyon National Park (1947)
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11. Butterflies of Grand Canyon National Park (1950)
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12. Prehistoric People of the Northern Southwest (1955)
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12. Prehistoric People of the Northern Southwest (ca. 1961)
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13. Grand Canyon Orign and Scenery (1961)
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14. The Story of Man at Grand Canyon (1967, 1972)
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