Vitamin A deficiency and its relation to hearing 
By: by Merle Lawrence ...
Publisher: Lancaster press, inc.
Published: 1941
Place of publication: [Lancaster, Pa
Language: eng
Number of pages: 48
Subjects: Hearing.; Vitamins.
Notes: Thesis (Ph. D.)--Princeton university, 1940.
Cover title.
"Reprinted from Journal of experimental psychology, vol. 29, no. 1, July, 1941."