The Personal Papers series includes correspondence, notes, diaries, photographs, and other materials relating to Hoskins travels, his time at Hill School and Princeton, and his service in both World Wars. Also included are correspondence, diaries, photographs, and scrapbooks that document several members of the Hoskins family, including his parents, Franklin Evans Hoskins and Harriet E. Hoskins, and their time as missionaries in Syria in the late 19th through early 20th century.

The 2014 accession is mainly comprised of photographs of Harold Hoskins's travels in the Middle East and his correspondence to his wife, Grania. To a lesser extent, it contains military documents from Hoskins's service in World War I and other documentation of his travels in the form of journals, postcards, and a map. Hoskins family photographs, personal correspondence related to the birth of Harold and Grania Hoskins's daughter, and a small amount of material on Harold Hoskins's father, Franklin Hoskins, is also included.

The Personal Papers series contains materials related to Beplat's work for the United States military in Japan. The papers include records of his appointment, paychecks, and permission to travel, his journal from October 1945 when he first arrived in Japan, materials to study the Japanese language, correspondence, photographs, and papers regarding the American Club which he co-founded.