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380 pages first pub 1998 (editions)

nonfiction science informative medium-paced
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missing page info first pub 1998 (editions)

nonfiction science informative medium-paced

408 pages first pub 1998 (editions)

nonfiction science informative medium-paced

304 pages first pub 1998 (editions)

nonfiction science informative medium-paced

220 pages first pub 1998 (editions)

nonfiction science informative medium-paced