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145 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced
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143 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

256 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

336 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

164 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

256 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

174 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

206 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

164 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

256 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced

224 pages first pub 1968 (editions)

nonfiction history memoir science challenging informative medium-paced