THE BOOK OF KNOWLEDGE; the children's encyclopedia. Editor-in-chief: E. V. McLoughlin. O-square ed.
THE BOOK OF KNOWLEDGE; the children's encyclopedia. Editor-in-chief: E. V. McLoughlin. O-square ed. NM: revisions & additions in text & pictures. © 19Feb43; A171231. Grolier, Inc. (PCW); 25May70; R485090.
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