Collection of eleven items signed by medical scientists and researchers, predominately consisting of photos ranging in size from 5 x 3 to 8 x 10, including: James D. Watson (FDC), Richard J. Roberts (SP), Daniel Carleton Gajdusek (SP), Charles H. Best (SP), Christiaan Barnard (SP), Benjamin Spock (SP), Denton A. Cooley (FDC), Hamilton O. Smith (signature), Robert W. Holley (SP), Linus Pauling (SP), and Georges J. F. Köhler (SP). In overall fine condition.