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128 pages first pub 1974 (editions)

nonfiction mathematics challenging informative medium-paced
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118 pages first pub 1974 (editions)

nonfiction mathematics challenging informative medium-paced

128 pages first pub 1974 (editions)

nonfiction mathematics challenging informative medium-paced

116 pages first pub 1974 (editions)

nonfiction mathematics challenging informative medium-paced