Folder contains a draft of a letter on Deborah Hospital letterhead, March 4, 1976, to companies that manufacture prosthetic heart valves, requesting photographs and technical descriptions for a guide to prosthetic cardiac valves. Folder also contains many unidentified photographs of synthetic heart valves, a few of them labeled Deborah Hospital on the back. The book was authored by Dryden Morse and Robert M. Steiner and published by the Medical Examination Publishing Company, Garden City, NY.