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552 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced
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732 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced

128 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced

128 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced

128 pages first pub 1990 (editions)

nonfiction reference science informative medium-paced

128 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced

480 pages first pub 2000 (editions)

nonfiction science challenging informative medium-paced