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345 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced
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190 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced

432 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced

345 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced

346 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced

missing page info first pub 1970 (editions)

nonfiction history science adventurous slow-paced

616 pages first pub 1970 (editions)

nonfiction history science adventurous slow-paced

missing page info first pub 1970 (editions)

nonfiction history science adventurous slow-paced