Tri-option controller reference aircraft manual - United States. Federal Aviation Administration; United States. Federal Aviation Administration. En Route Instructional Systems Unit. (Oklahoma, City, Okla. : En Route Instructional Systems Unit, AAC-931D, Mike Monroney Aeronautical Center, 1991)
"ATG-2" --Cover.
"April 1991."
Includes bibliographical references (p. 227).
Mode of access: Internet.
Keywords: Air traffic control -- United States; Helicopters -- Recognition; Airplanes -- Recognition