Dr. Cline graduated from Indiana University School of Medicine in 1921. He began practice in Dayton, Ohio, in 1923 and specialized in gynecology. He was a commissioned medical officer for the federal government and worked for a time in Budapest, Hungary. The collection contains a portfolio of case studies and surgery performed in Europe, possibly for board certification.

The core of his collection was donated by Dr. Homer E. Cassel. The collection consists of county histories, autobiographies, obituaries, directories, and the histories and annual reports of hospitals in the Miami Valley and southwest Ohio.

Dr. MacGregor graduated from the University of Michigan Medical School in 1889 and Columbia University College of Physicians and Surgeons in 1890. He was a member of the Ohio State Medical Association and was a commissioned medical officer for the federal government. The collection consists of miscellaneous photographs dating most likely between 1886 and 1897.