Because of ability to fly slowly and at low altitudes, helicopter seems particularly useful on timber surveys; to date few, if any, large scale tests of helicopter as aid in timber inventories have been made; procedures and results of such test in South Carolina.
Forest survey tests helicopter
J Forestry
Journal of Forestry ; 45 , n 12
1947
6 pages
Aufsatz (Zeitschrift)
Englisch
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