The Correspondence series comprises the bulk of the documentation. The records consist of both incoming and outgoing correspondence and include discussions of thoracic cases, patient referrals, case histories, as well as information on former students and residents, and professional material relating to presentations, articles, and various surgical and medical organizations. The creation of the first two-year training program in thoracic surgery is particularly well documented. The correspondence was primarily sent or received by John Alexander and Cameron Haight although other surgeons within the Section of Thoracic Surgery are also represented.
The correspondence deals extensively with tuberculosis and includes letters and reports from sanatoriums and physicians throughout Michigan and the world. Alexander, who himself suffered from tuberculosis, wrote extensively on the topic as evidenced in these records. Correspondents include numerous pioneers and luminaries in the field of thoracic surgery and illustrates the growing specialization within the field. Key correspondents include: Alfred Blalock; Norman Bethune; Duane Carr; Frederick Coller; Harvey Cushing; Elliott Cutler; Evarts Graham; Samuel C. Harvey; Charles H. Frazier; Rudolf Nissen; Ferdinand Sauerbruch; Emile Sergent; Robert Shaw; and John D. Steele.
The correspondence has been retained in its original order. Correspondence is filed by year and alphabetically within each year, although the individual letters are not alphabetized within folders. The alphabetical arrangement is a mixture of filing by the name of the sender and topical filing by the person or subject of the letter. For example, letters from Evarts Graham will be found under "G" for Graham as well as under "J" when the subject was the Journal of Thoracic Surgery. There are several gaps within this series, and in some instances a portion of the alphabet is missing for particular years. The filing is generally only by letter, A-Z, although specific subjects begin to appear in the later years such as "American Review of Tuberculosis," "Tuberculosis Sanatorium Commission," "postgraduates," and "veterans administration." From 1955 to 1958 a more topical arrangement is present.