Rotary-wing aerodynamics. - Stepniewski, W. Z. 1909- (Dover Publications, 1984)
"An unabridged, slightly corrected republication in one volume of the work originally published in two volumes by the Science and Technical Information Office of the National Aeronautics and Space Administration ... in 1979. Volume II ... is being reprinted here from the 1981 edition revised and edited by W.Z. Stepniewski for the U.S. Army Air Mobility Research and Development Laboratory"–Title page verso