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816 pages first pub 1974 (editions)

nonfiction challenging informative medium-paced
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639 pages first pub 1974 (editions)

nonfiction challenging informative medium-paced

missing page info first pub 1974 (editions)

nonfiction challenging informative medium-paced

640 pages first pub 1974 (editions) user-added

nonfiction challenging informative medium-paced