His papers contain biographical material, including his unfinished memoir about his year with Frank Lloyd Wright at Taliesin and photographs taken during his time there. Also included are reports, printed materials, and drawings for assorted designs in his own practice, and for William Pereira, Pereira and Luckman, and Charles Luckman, as well as for Herzka & Knowles. Projects at Pereira for which Cusack had design responsibility include the California Federal Savings and Loan Building in Los Angeles, the Lockheed Corporation headquarters in Calabasas, the west terminal (now called the Bradley terminal) for the Los Angeles International Airport, and several master plans and reports for other projects,including campus planning for the University of California, Santa Barbara.