Stephens, C. Physiology of the eye and sight : of practical use to everybody ... - New York : The New York College of Health, 1871. - 48 p. : ill. ; 26 cm. An advertisement of the Duplex eye-sight restorer. LCCN: ca 33000745 Subjects--Topical Terms: Eye--Physiology. LC Class. No.: RE999 / .S82