523.83 Bur M Burnham, Sharburne Weslwy, 1838-1921 Measures of proper motion star made with the 40-inch refractor of the yerkes Observatory in the years 1907 to 1912 by S.W. Burnham. washington, carnegie Institution of Washungton, 1913 iv, 311p. tablas. 30cm. (Carnegie Institution of Washington. Publication No. 168)