The Correspondence series (1.35 linear feet) is organized as it was received. Correspondence is arranged by year and then, generally, according to author. The majority of the materials are written by Marion Blydenburgh and George (Theron) Blydenburgh to family members in the United States describing daily life, family matters, and news of the hospital's progress during their time in China from 1920-1931. The first exception is a small amount of materials related to George and Marion Blydenburgh's travels in the United States prior to their departure to China from San Francisco in 1920 as well as a return trip to the United States by the Blydenburgh family in 1925. The second exception is materials related to the Blydenburgh family's time spent in Japan and Korea after their evacuation from Nanchang due to incidents related to military campaigns and subsequent events in 1927.