[Letter from J. W. Behnken to R. Osthoff, March 24, 1931]
Description:
Letter from J. W. Behnken to R. Osthoff, discussing the acoustics in a classroom.
Date:
March 24, 1931
Creator:
Behnken, J. W.
Item Type:
Refine your search to only
Letter
Partner:
Concordia University Texas