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missing page info first pub 1992 (editions)

nonfiction biography science challenging informative medium-paced
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360 pages first pub 1992 (editions)

nonfiction biography science challenging informative medium-paced

360 pages first pub 1992 (editions)

nonfiction biography science challenging informative medium-paced

303 pages first pub 1992 (editions)

nonfiction biography science challenging informative medium-paced