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by Richtmyer, F. K. (Floyd Karker), 1881-1939 | Kennard, E. H. (Earle Hesse), b. 1885 [joint author.] | Cooper, John N [joint author.].
by Richtmyer, F. K. (Floyd Karker), 1881-1939.
by Richtmyer, F. K | Kennard, E. H.