The Hu, Tin-an (Hu, Ding'an) papers documented Dr. Hu's research writings during his time at Columbia University as a research scholar from 1950 to 1953. Materials in the papers are the research writings on the background of moxa, acupuncture, and Chinese medicine, as well as correspondence regarding Dr. Hu's work progress, performance as a research scholar, and his membership in the Societe Internationale d'Acupuncture.