Contains correspondence received and sent by Caplan, pertaining to the many organizations that he belonged to. These organizations include. Aleph Zadik Aleph (A.Z.A.), American National Red Cross-National and Tidewater Chapter, B’nai B’rith, Civitan, Norfolk Junior Chamber of Commerce, Monday Morning Group, and ODU Alumni. The dates of the correspondence range from 1944 to 1990, and are arranged alphabetically.