The Champlin encyclopedia: science and invention. Vol.9-12. Edited by George Moreby Acklom, revised by F. Dorothy Wood.
R584990. The Champlin encyclopedia: science and invention. Vol.9-12. Edited by George Moreby Acklom, revised by F. Dorothy Wood. NM: additions & revisions. © 23Aug46; A3971. Consolidated Book Publishers (PWH); 16Aug74; R584990.
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