^Butler, Gerald W; Shaner, Mary; Shaner, Richard; Shaner, Richard (May 2001). The Guns of Boston Harbor. AuthorHouse. ISBN9780759647305. Retrieved 2013-03-01. In 1958, the Federal Aviation Administration (FAA) constructed long-range acquisition radar at Fort Heath. Commissioned in 1959, the ARSR-1 radar was used to track aircraft 220 miles distant for flight-following" purposes. …the army and air force also used this surveillance radar for Air Defense Control and Coordination Systems (ADCCS).{{cite book}}: CS1 maint: multiple names: authors list (link)
^Del Papa, Dr. E. Michael; Warner, Mary P. (October 1987). A Historical Chronology of the Electronic Systems Division 1947-1986(PDF) (Report). Archived(PDF) from the original on December 24, 2013. Retrieved 2012-07-19. so-called Semi-Automatic Direction Center System, later known as…Semi-Automatic Ground Environment System, in essence, the Lincoln Transition System.