The correspondence consists of notes and letters between Oliver Barrett and Carl Sandburg, 1925-1950, letters to Carl Sandburg from other people, 1925-1949 and letters to and from Oliver Barrett from other people, 1922-1934. Also, a small collection of letters to Roger Barrett, Oliver Barrett's son, 1933-1966, including correspondence with Herbart Mitgang, editor of The Letters of Carl Sandburg, published in 1968. Organized with Carl Sandburg-Oliver Barrett correspondence preceding Sandburg's, Barrett's and Roger Barrett's letters to and from others.