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748 pages 1982

nonfiction science challenging informative medium-paced
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1008 pages hardcover 1982

nonfiction science challenging informative medium-paced

896 pages hardcover 1982

nonfiction science challenging informative medium-paced

300 pages paperback 1991

nonfiction science challenging informative medium-paced

748 pages hardcover 1982

nonfiction science challenging informative medium-paced

missing page info 1982

nonfiction science challenging informative medium-paced

384 pages paperback 1991

nonfiction science challenging informative medium-paced

833 pages 1982

nonfiction science challenging informative medium-paced