A group of letters spanning Welch's career, chiefly written to him, but including one early 1887 letter returning a revised manuscript to Dr. Canfield. One notable letter introducing Welch, then at Johns Hopdkins, to Congressman Robert Bremner, is signed by Woodrow Wilson from the White House in 1913. Includes many pieces of correspondence to and from Wilburt C. Davison of the Duke University School of Medicine, including a 1933 telegram to Welch on the occasion of the 2nd anniversary.