Riecker Memorial Lecture No. 4
University of Arizona Bulletin Series
Vol. XXIX – Number 4
September, 1958
Copyright, 1958
University of Arizona Press
Published by
University of Arizona Press
Tucson, Arizona
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Entered as second-class mail matter December 29, 1936, at the post office at Tucson, Arizona, under the Act of August 24, 1912. Acceptance for mailing at special rate of postage provided for in Section 1103, Act of October 3, 1917, authorized June 29, 1921.