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180 pages first pub 1974 (editions)

nonfiction essays science adventurous informative reflective slow-paced
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160 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

160 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

192 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

153 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

180 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

159 pages first pub 1974 (editions)

nonfiction essays science adventurous reflective relaxing slow-paced

180 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

184 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced

4 hours, 12 minutes first pub 1974 (editions) user-added

nonfiction essays science challenging informative reflective slow-paced

179 pages first pub 1974 (editions)

nonfiction essays science challenging informative reflective slow-paced