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The Correspondence series (1918-1991, approximately 3 linear feet) consists of letters written to and from the multiple members of the extended Lewis family. Parents Ralph and Roberta are the largest contributors to this series, often signing off their letters to their children as "MODAD" (likely to stand for a combination of "Mom" and "Dad"). Early letters from Reberta to her immediate family are often signed with either "Berta" or "Bertie". The letters offer insight into the day-to-day life of the individual who wrote them during their travels abroad, and span from 1918 to 1991, four generations of the Lewis family, and topics ranging from birth certificates to funding.

The Visual Material series (1930s-1980 and undated, 4 linear feet contained in 5 boxes) includes photo albums, boxes with slides, scrapbooks and news clippings. The vast majority of the material are in the form of 35 mm slides highlighting vacations and travels around Asian countries (such as China, Thailand, Malaysia, and Japan), as well as vacations to the United States. Material also includes photographs of the family as they lived abroad, as well as a few newsclippings related to either Ralph, Roberta, or R. Charles' work.

The Biographical Material series (1967 and 1972, 2 folders) contains of a sample of passports from Ralph and Roberta, and a daily diary kept by Ralph in 1972 while in Bangkok, Thailand.