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400 pages first pub 200 (editions)

nonfiction classics philosophy science informative medium-paced
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96 pages first pub 200 (editions)

nonfiction classics philosophy science informative medium-paced

132 pages first pub 200 (editions)

nonfiction classics philosophy science informative medium-paced

96 pages first pub 200 (editions)

nonfiction classics philosophy science informative medium-paced

94 pages first pub 200 (editions)

nonfiction classics philosophy science informative medium-paced