Contributions from the Observatory of Columbia University, New York.

no.1-2; no.3; no.4; no.5; no.5-07 yr.1893-95; no.6; no.7; no.8; no.8-9; no.9; no.10/11; no.10-19; no.10-15 yr.1897-98; no.12/14; no.15; no.16; no.16 yr.1900; no.17; no.17 yr.1901; no.18; no.18 yr.1901; no.10-20 1897-1903; no.10-21 (1897-1904); no.15-21 1898 - 1904; no.19; no.19-21 yr.1902-04; no.20; no.20-28; no.21; no.22; no.22 (1904); no.23; no.23 (1905); no.1-7, 10-14 1892-1906; no.8-9 (1895-1906); no.1-02 yr.1906; no.1-7 1906; no.9 yr.1906; no.24; no.25; no.25 (1908); no.22-27 yr.1904-09; no.26; no.27; no.27 (1909); no.22-24, 27-28 1904-1910; no.28/29; no.28 (1910); no.25, 29 1908-1915; no.29 (1915); no.31 1938; no.32 1952; no.33 1956