Telescope Data Center Harvard Plate Collection Harvard-Smithsonian Center for Astrophysics
Harvard Observatory Plate Stacks
RH Series Plate Centers

Click here for temporal distribution

Entire Series
(21983 plates)

1920-1930
(4459 plates)

1930-1940
(2679 plates)

1940-1950
(3395 plates)

1950-1952
(1890 plates)