00739cam a22002411 4500 sg 45000050 DLC 20260227112745.0 770416s1944 xx 000 0 eng c sg 45000050 (OCoLC)2892933 U. S. Surg.-gen. off. Libr. ODa DLC RE961 .O3 1944 617.75 Obrig, Theodore Ernst. Modern ophthalmic lenses and optical glass, by Theo. E. Obrig. 3d ed. New York, [Philadelphia, The Chilton company, Printing division] 1944. xix, 323 p. illus., diagrs. (1 fold.) 22 cm. Bibliography: p. 302-306. Lenses. Optical glass. 90537 90537