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256 pages first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced
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256 pages first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

302 pages first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

missing page info first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

284 pages first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

224 pages first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

missing page info first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced

missing page info first pub 1938 (editions)

nonfiction mathematics science adventurous reflective slow-paced