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640 pages first pub 1969 (editions)

nonfiction education challenging informative slow-paced
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missing page info first pub 1969 (editions)

nonfiction education challenging informative slow-paced

missing page info first pub 1969 (editions)

nonfiction education challenging informative slow-paced

missing page info first pub 1969 (editions)

nonfiction education challenging informative slow-paced