Harvard-Smithsonian Center for Astrophysics Harvard Observatory Plate Stacks MA Series Plate Centers Click here for temporal distribution

Entire Series (6193 plates)

1905-1910 (831 plates)

1910-1920 (744 plates)

1920-1930 (352 plates)

1930-1940 (3135 plates)

1940-1950 (988 plates)

1950-1977 (145 plates)