The collection spans the years 1933 to 2001, and includes DeMars' personal papers, records from his private practice and professional career, and materials generated by the firms DeMars & Reay, DeMars & Wells, and DeMars & Maletic.

The Donald L. Hardison Collection spans the years 1936-2003, and includes files created by Hardison and his firms. The collection is organized into four series: Personal Papers, Professional Papers, Office Records, and Project Records that cover Hardison’s career including his education, professional interests and involvement with associations, and architectural practice.