Published by National Advisory Committee for Aeronautics, Washington, 1944
First Edition
First edition. Technical Notes National Advisory Committee for Aeronautics No. 806; Stapled with card covers; 12 single-sided pages plus 26 pages of figures; Stamped 'Restricted' and 'Classified' and 'Classification Cancelled' and stamped with a company receipt. Very good condition except for a couple pieces missing from cover corners.