The collection contains reflections of the girlhood of Mary Belle Harris, her education in the U.S. and Europe, professions, travel and relationships with Jane Addams, Maud Ballingon Booth, Julia Anna Gardner, Elsie Janis, Elizabeth “Betty” Munger, Doris Reid, Ruth Byron, Owen Rohdy, Helen Hall Upham, Mabel Walker Willebrandt, and Caroline B.S. Wittpenn. Materials include publications, albums, diaries, personal writings, professional writings, photographs, sheet music, numismatic collection, and family trees.