The collection consists of two volumes of carbon copy letterbooks owned by Dain L. Tasker, an early faculty member of the
Pacific School of Osteopathy and Infirmary (later the California College of Medicine, incorporated into the University of
California, Irvine). Tasker's books represent outgoing correspondence from 1900-1906 and 1913-1938 of this faculty member
of the College, who instigated the recognition of the separate D.O. degree in 1914.