The collection consists of fifteen letters written between 1940 and 1953 by Dr. Harry W. Miller and Dr. Samuel Phang, a 1933 graduate of the College of Medical Evangelists, to each other. Dr. Phang had worked with Dr. Miller at the Wuhan Sanitarium in China. The letters are primarily concerned with Seventh-day Adventist medical work in China, but also include discussion of Dr. Miller's work with soy foods, both in China and the United States. As Drs. Miller and Phang were lifelong friends, there is also talk of family and friends.