Prepared by a staff specialists under the editorship of Ovid W.Eshbach. prepared by a staff of specialists under the editorship of Joseph J. Mattiello. prepared by a staff of specialists under the editorship of Mott Souders and Ovid W. Eshbach. prepared by a staff of specialists under the editorship of Robert H. Mosher and Dale S. Davis. Prepared by a staff of specialists under the editorship of Harold Pender, William A. Del Mar and Knox McIlwain. prepared by a staff of specialists. Assistant editor: H. L. Pinkerton. Prepared by a staff of technical experts under the direction of E. Molloy. prepared by a staff of specialists J.Kenneth Salisbury editor.