Boredom and other factors in the physiology of mental effort : an exploratory study / by Joseph E. Barmack.

New York : [s.n.], 1937.

83 pages : illustrations ; 26 cm.

Issued also as thesis (PH. D.) Columbia University.

With : Memory trace for figures in recall and recognition / Hanawalt, Nelson Gilbert. New York, 1937. Bound together subsequent to publication.

Includes bibliographical references (p. 81-83).