Edited by Johann Engel. Publication information from colophon. University Park holds two copies with differing Readex Microprint dates and quality of print.
Reproduction Note
Micro-opaque. New York : Readex Microprint, 1973. 3 cards ; 23 x 15 cm. (Landmarks of science). Micro-opaque. New York : Readex Microprint, 1968. 3 cards ; 23 x 15 cm. (Landmarks of science).
