Sleep and learn. [electronic resource]
Material type: TextPublication details: New York, Robert Leni Corp. [c1963]Edition: [2d ed.]Description: 157 p. 21 cmSubject(s): LOC classification:- BF1156.S8 C8 1963
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First ed. published in 1960 under title: Learn while you sleep.
Bibliography: p. 155-157.
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