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137 pages first pub 1997 (editions)

nonfiction history science informative medium-paced
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162 pages first pub 1997 (editions)

nonfiction history science informative medium-paced

160 pages first pub 1997 (editions)

nonfiction history science informative medium-paced

160 pages first pub 1997 (editions)

nonfiction history science informative medium-paced