AS27: The pipe is being buried in a mechanically frozen ditch to ensure a crossing for the Nelchina (Nel-chee-na) caribou herd, which numbers between 8,000 and 10,000. This crossing was chosen because of the known migrations of the herd over the past 20 years., 1976-05, PCA0002-1b-31, Folder: PCA0002-1b. 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/17369 Accessed February 22, 2025.