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344 pages first pub 1999 (editions)

nonfiction science informative medium-paced
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352 pages first pub 1999 (editions)

nonfiction science informative medium-paced

344 pages first pub 1999 (editions)

nonfiction science informative medium-paced

432 pages first pub 1999 (editions)

nonfiction science informative medium-paced

missing page info first pub 1999 (editions)

nonfiction science informative medium-paced

354 pages first pub 1999 (editions) user-added

nonfiction science informative medium-paced

missing page info first pub 1999 (editions)

nonfiction science informative medium-paced

missing page info first pub 1999 (editions) user-added

nonfiction science informative medium-paced

423 pages first pub 1999 (editions)

nonfiction science informative medium-paced

388 pages first pub 1999 (editions)

nonfiction science informative medium-paced

434 pages first pub 1999 (editions)

nonfiction science informative medium-paced