The Arthur Erich Haas collection consists of materials created by Arthur Erich Haas, his wife Emma Beatrice Haas (nee Huber), their sons Arthur G. and George (Georg) Haas, and their granddaughter Patricia Haas-Cleveland. The collection also contains materials created by Arthur E. Haas' brother Otto Heinrich Haas, sister Greta Gerstenberger, and other family members.

The collection primarily contains the personal papers and correspondence of Arthur E. Haas with his wife Emma B. Haas, his brother Otto Haas, his sister Greta Gerstenberger, and others. Arthur E. Haas' personal papers include his middle and high school grades and diplomas, his college grades and diploma, his academic appointments in Austria, and documentation of other honors and achievements. The collection also contains newspaper clippings about Arthur E. Haas (1920-1941), predominantly about his lecture tours in the United States (1927-1936), and an autobiographical fragment written by Arthur E. Haas in 1937. Additionally, the collection contains correspondence by Arthur G. Haas and Patricia Haas-Cleveland with researchers writing articles and books about Arthur E. Haas, as well as articles and other documents collected by Michael Wiescher for his book on Arthur E. Haas.

Emma B. Haas’ papers include correspondence with her father Michael Huber and brother Georg Huber (1924-1939), her sons Arthur G. and George Haas (1927-1930), and French philosopher Yves Simon (1943-1953). The collection also contains Emma’s middle and high school records, college course records (1909-1935), notes and typed manuscripts of her talks, and newspaper clippings about her. Additionally, the collection contains a selection of postcards collected on various trips to the Middle East, North Africa, Italy, Spain, France, Greece, Germany, Austria, Switzerland, Japan, and the United States.

The papers of Otto Haas include correspondence; his middle, high school, and college records; military records; his permit to practice law in Austria; and newspaper articles about the murder of his daughter Dorothea in Chicago in 1969.

Papers of other family members include correspondence with Arthur G. Haas, mostly fielding questions from researchers about his father Arthur E. Haas, and a family tree compiled by Arthur G. Haas; David Haas' dissertation, journals, calendars, and related correspondence (1820 -1975); correspondence of Gustav Haas and Gabriele Strakosch (1882-1907); and photographs of the extended Haas /Huber family (1890 -2001).