National Research Council (U.S. Committee on Celestial Mechanics.
Celestial mechanics : Report of the Committee on celestial mechanics of the National research council / by E.W. Brown... chairman ; G.D. Birkhoff... A.O. Leuschner... H.N. Russell.
Celestial mechanics.
Brown, Ernest W. (Ernest William), 1866-1938.
Birkhoff, George David, 1884-1944.
Leuschner, Armin Otto, b. 1868.