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missing duration info first pub 1957 (editions)

nonfiction nature science travel adventurous medium-paced
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180 pages first pub 1957 (editions)

nonfiction nature science travel adventurous informative slow-paced

174 pages first pub 1957 (editions)

nonfiction nature science travel adventurous informative slow-paced

missing duration info first pub 1957 (editions)

nonfiction nature science travel adventurous informative slow-paced