Van Biesbroeck, George, 1880-1974. Measurements of double stars. by G. Van Biesbroeck. - Chicago : University of Chicago Press, [1954]. - 223 p. 30 cm. - Publications of the Yerkes observatory. v. 8, pt. 6 . - 523.84 . Pages also numbered 159-381. Subjects--Topical Terms: Double stars. Dewey Class. No.: 523.84