Forces in balloon logging
By: by Charles N. Mann.
Contributors: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Series: U.S. Forest Service research note PNW -- 28.
Publisher: Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture
Published: 1965
Place of publication: Portland, Or
Language: eng
Subjects: Balloon logging -- Mathematical models.; Balloons -- Aerodynamics -- Mathematical models.
Notes: Caption title.

"August 1965."