State of Washington ex rel. The City of Seattle, City of Spokane, City of Bellingham, City of Yakima and City of Tacoma vs. The Department of Public Utilities of Washington; Andrew J. Zimmerman as Director and The Pacific Telephone and Telegraph Company, a Corporation , 1950 - 1952, Box: 98, Folder: 2. Supreme Court Briefs, 4404-01. Seattle Municipal Archives. https://leglas100/finding-aids/repositories/2/archival_objects/229150 Accessed June 22, 2026.