Depths of the earth; caves and cavers of the United States
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| Main Author: | |
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| Format: | Book |
| Language: | English |
| Published: |
New York,
Harper & Row
[1966]
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| Edition: | [1st ed.] |
| Subjects: |
| Physical Description: | xiii, 398 p. illus., maps. 22 cm. |
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| Bibliography: | Bibliography: p. 383-387. |