Commercial helicopter logging in the Pacific Northwest in the seventies
Subtitle: a new forestry tool
By: by Bruce Lee Casey.
Published: 1972
Language: eng
Number of pages: 62
Subjects: Logging, Aerial -- Northwest, Pacific.
Notes: Typescript (photocopy).

"A paper submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Forestry, 1972."

Bibliography: leaves 54-55.