Mobil travel guide Northwest and Great Plains.
Mobil Oil Corporation.cn
Chicago, IL : Rand McNally,
1977-
Vols. for [1988-] published: New York, N.Y. : Prentice Hall Press.
Section title varies slightly, 1989-   : Northwest and Great Plains.
Description based on: 1983.
Published in collaboration with Mobil Oil Corporation, [1978-].