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216 pages first pub 1913 (editions)

nonfiction science informative medium-paced
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270 pages first pub 1913 (editions)

nonfiction science informative medium-paced

212 pages first pub 1913 (editions)

nonfiction science informative medium-paced

331 pages first pub 1913 (editions)

nonfiction science informative medium-paced

331 pages first pub 1913 (editions)

nonfiction science informative medium-paced

334 pages first pub 1913 (editions)

nonfiction science informative medium-paced

726 pages first pub 1913 (editions)

nonfiction science informative medium-paced