U.S. Environmental Protection Agency: SSFL Workgroup Invitation, 1997 July 30, id59779, Box: 71, Folder: 14. Boeing Company, Rocketdyne Propulsion and Power, Santa Susana Field Laboratory Activities Reports Collection, URB-ROCK. Special Collections & Archives. https://findingaids.csun.edu/repositories/2/archival_objects/43125 Accessed June 03, 2026.