United States. Office of Scientific Research and Development. National Defense Research Committee, issuing body. text eng Title on half-title page: Summary technical report of the National Defense Research Committee. "Manuscript and illustrations for this volume were prepared for publication by the Summary Reports Group of the Columbia University Division of War Research under contract OEMsr-1131 with the Office of Scientific Research and Development. This volume was printed and bound by the Columbia University Press"--Unnumbered page ii. LC Science, Business & Technology copy no. 6. In a set of declassified documents held as a collection by the Library of Congress. Includes bibliographical references (pages 547-556) and index. Underwater acoustics. Naval research--United States. Also available in digital form. http://hdl.loc.gov/loc.gdc/scd0001.00433840148