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320 pages first pub 1956 (editions)

nonfiction essays science adventurous challenging reflective slow-paced
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320 pages first pub 1956 (editions)

nonfiction essays science adventurous challenging reflective slow-paced

319 pages first pub 1956 (editions) user-added

nonfiction essays science adventurous challenging reflective slow-paced

missing page info first pub 1956 (editions)

nonfiction essays science adventurous challenging reflective slow-paced