Professional correspondence and publications of Ida M. Tarbell from 1890 - 1943. In addition, Tarbell's research materials for her writings on Abraham Lincoln (1890s - 1938), and her autobiography All in a Day’s Work.
A collection of letters from Stephen R. Clark, son of Allegheny College president Homer J. Clark (1837-1847), who was enlisted in the Civil War between 1863 and 1865
