Hewlett-Packard electronic distance measuring device being used by the control surveying crew. This equipment was beginning to become standard issue in the industry; but cost, at the time, did not permit widespread use by ADOT surveying crews., 1977-05, PCA0522-47, Box: PCA0522. Robert Burrell Slide Collection, 1975-1977, PCA 522. Alaska State Library - Historical Collections Finding Aids. https://alaska.libraryhost.com/repositories/2/archival_objects/16802 Accessed November 06, 2024.