Visual aids : their construction and use /

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Bibliographic Details
Main Author: Weaver, Gilbert G. (Gilbert Grimes), 1889-
Other Authors: Bollinger, Elory W. (Elory William), 1897-
Format: Book
Language:English
Published: Toronto : Van Nostrand, 1949.
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Description
Physical Description:388 p. : ill. ; 24 cm.