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800 pages first pub 1974 (editions)

nonfiction nature reference science adventurous informative medium-paced
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9000 pages first pub 1974 (editions)

nonfiction nature reference science adventurous informative medium-paced

517 pages first pub 1974 (editions)

nonfiction nature reference science adventurous informative medium-paced

1000 pages first pub 2003 (editions)

nonfiction nature reference science adventurous informative medium-paced