Helicopters--calculation and design

Uniform Title: Vertolety--raschet i proektirovanie. English
Published: Springfield, Va. : National Aeronautics and Space Administration, [1967-]
Springfield, Va. : For sale by the Clearing-house for Federal Scientific and Technical Information.
Physical Description: volumes : illustrations ; 28 cm.
Additional Creators: Milʹ, M. L. (Mikhail Leontʹevich)