Traffic advisory practices at airports without operating control towers.
Series: Advisory circular -- AC no. 90-42F.
Publisher: U.S. Dept. of Transportation, Federal Aviation Administration
Published: 1990
Place of publication: Washington, D.C
Language: eng
Subjects: Airplanes -- Landing -- Safety regulations -- United States.; Airports -- Traffic control.
Notes: Caption title.

Shipping list no.: 97-0161-P.

"5/21/90."