AS 118: A Rocsaw, of a chain-saw like trenching machine attached to a D-9 Caterpillar tractor, is used to cut a 16-inch wide ditch through the frozen soil., 1976-03, PCA0002-1a-45, Folder: PCA0002-1a. Alyeska Pipeline Service Company : Trans-Alaska Pipeline Construction Collection, 1976-1977, PCA 2. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/17321 Accessed February 22, 2025.