A general catalogue of double stars within 121 of the North Pole
A two-volume observational catalogue of double stars compiled by American astronomer S. W. Burnham and issued by the Carnegie Institution of Washington in 1906 for working astronomers. Pages are dense tables of dates, position angles and separations set in small type, punctuated by plotted orbit diagrams with dated dots along a line and labelled axes at 0, 90, 180, 270 degrees.
