Visual aids
Subtitle: their construction and use
By: by Gilbert G. Weaver and Elroy W. Bollinger.
Contributors: Bollinger, Elroy William, 1897- joint author.
Publisher: D. Van Nostrand Co.
Published: 1949
Place of publication: New York
Language: eng
Number of pages: 388
Subjects: Visual education.
Notes: Includes bibliographical references.