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1060 pages first pub 1978 (editions)

nonfiction science informative slow-paced
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972 pages first pub 1978 (editions)

nonfiction science informative slow-paced

128 pages first pub 1978 (editions)

nonfiction science informative slow-paced

1129 pages first pub 1978 (editions)

nonfiction science informative slow-paced