Helicopters for logging
Subtitle: characteristics, operation, and safety considerations
By: P. M. Stevens, Edward H. Clarke.
Contributors: Clarke, Edward H.
Series: USDA Forest Service general technical report PNW -- 20.
Publisher: Pacific Northwest Research Station, U.S. Dept. of Agriculture, Forest Service
Published: 1974
Place of publication: Portland Or
Language: eng
Number of pages: 16
Subjects: Helicopters.; Lumbering -- Machinery.; Logging, Aerial.
Notes: Cover title.

Bibliography: p. 16.