![](natural/glac/1/1950.jpg)
1. Motorist's Guide to the Going-to-the-Sun Highway (1950 rev.)
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![](natural/glac/2/1952.jpg)
2. Glaciers and Glaciation in Glacier National Park (1952 rev. ed.)
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![](natural/glac/2/1962.jpg)
2. Glaciers and Glaciation in Glacier National Park (1962 reprint)
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![](natural/glac/3/1957.jpg)
3. The Geologic Story of Glacier National Park (1957)
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![](natural/glac/3/1971.jpg)
3. The Geologic Story of Glacier National Park (1971 reprint)
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![](natural/glac/4/1956.jpg)
4. Trees and Forests of Glacier National Park (1956 rev.)
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![](natural/glac/4/1961.jpg)
4. Trees and Forests of Glacier National Park (1961 rev.)
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![](natural/glac/5/1957.jpg)
5. 101 Wildflowers of Glacier National Park (1957)
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![](natural/glac/5/1967.jpg)
5. 101 Wildflowers of Glacier National Park (1967 reprint)
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![](natural/glac/6/1955.jpg)
6. Mammals of Glacier National Park (1955)
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![](natural/glac/6/1967.jpg)
6. Mammals of Glacier National Park (1967 reprint)
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![](natural/glac/7/19.jpg)
7. Climate of Glacier National Park (1967 rev. ed.)
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![](natural/glac/8/1962.jpg)
8. Through the Years in Glacier National Park (1962 reprint)
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![](natural/glac/9/1964.jpg)
9. Birds of Glacier National Park (1964)
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![](natural/glac/1975at.jpg)
Animal Tracks of Glacier National Park (1969, rev. ed. 1971, 1975)
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![](natural/grca/1/1935.jpg)
1. Mammals of the Grand Canyon Region (1935)
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![](natural/grca/2/1935.jpg)
2. History and Exploration of the Grand Canyon Region (1935)
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![](natural/grca/3/1936.jpg)
3. Trees of Grand Canyon National Park (1936)
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![](natural/grca/4/1936.jpg)
4. Contributions to Grand Canyon Ornithology (1936)
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![](natural/grca/5/1936.jpg)
5. Contributions to Grand Canyon Geology (1936)
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![](natural/grca/6/1936.jpg)
6. Check-List of Plants of Grand Canyon National Park (1936)
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![](natural/grca/7/1936.jpg)
7. Prehistoric Man in the Southwest (1936)
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![](natural/grca/8/1937.jpg)
8. Check-List of Birds of Grand Canyon National Park (1937)
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![](natural/grca/9/1938.jpg)
9. Amphibians and Reptiles of Grand Canyon National Park (1938)
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![](natural/grca/10/1947.jpg)
10. Plants of Grand Canyon National Park (1947)
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![](natural/grca/11/1950.jpg)
11. Butterflies of Grand Canyon National Park (1950)
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![](natural/grca/12/1955.jpg)
12. Prehistoric People of the Northern Southwest (1955)
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![](natural/grca/12/1961.jpg)
12. Prehistoric People of the Northern Southwest (ca. 1961)
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![](natural/grca/13/1961.jpg)
13. Grand Canyon Orign and Scenery (1961)
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![](natural/grca/14/1972.jpg)
14. The Story of Man at Grand Canyon (1967, 1972)
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