Recording magnification in photomicrographs /
Hellmer, Alice M.
Recording magnification in photomicrographs / Alice M. Hellmer - [S.l. : s.n.], 1944 - 41-42 p. : ill. ; 25 cm - Journal of the biological photographic association ; 13 .
Recording magnification in photomicrographs / Alice M. Hellmer - [S.l. : s.n.], 1944 - 41-42 p. : ill. ; 25 cm - Journal of the biological photographic association ; 13 .