Manastash Ridge Observatory was created in 1972.
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Magdalena Ridge Observatory was created in 1999.
Oak Ridge Observatory was created in 1933.
Stony Ridge Observatory was created in 1963.
The address of the Stony Ridge Observatory is: Po Box 892769, Temecula, CA 92584-8796
Haleakala Observatory was created in 1961.
Dearborn Observatory was created in 1889.
Kiso Observatory was created in 1974.
Stellafane Observatory was created in 1924.
Steward Observatory was created in 1916.
Union Observatory was created in 1903.
Erbil Observatory was created in 1973.