His Illustrated manual of neurologic diagnosis, 1962.

Solo, c1995: t.p. (R. Douglas Collins, M.D.; CFII) p. 4 of cover (Doug Collins; FAA medical examiner; teaches flying in Lancaster, Calif.)

Information from 678 converted Dec. 19, 2014 (M.D.)

Diagnosis and management of neck and back pain in primary care, [2018]: t.p. (R. Douglas Collins, MD, FACP; formerly senior FAA medical examiner, former associate professor of medicine, Medical University of South Carolina, former associate clinical professor of medicine, University of Florida School of Medicine, Chatsworth, California)

British Library author letter received 20 October 1988 (Robert Douglas Collins, born 1933)