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26-inch Refractor Telescope (1)
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Astrograph (1)
Astrographic Catalog (58)
Astronomer (10)
Astronomers (4)
Astronomical Glass Plates (261)
Astronomical Instrument (2)
Astronomical Instrumentation (1)
Astronomical Instruments (49)
Astronomical Photography (620)
Astronomy (143)
Automatic Time Transmitter (1)
Baker Oregon (1)
British Astronomical Association (1)
Brown (3)
Building (1)
Building And Grounds (1)
Buildings (1)
Buildings And Grounds (5)
Burbank (1)
Captain (1)
Carte Du Ciel (58)
CB Watts (1)
Charles Wilkes (1)
Chronograph (6)
Civil War (1)
Clock (12)
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Clocks (1)
Constellations (1)
Construction (845)
Corona (2)
Doctor See (1)
Dome (1)
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Expeditions (77)
Expedition Station (2)
Family (1)
Flagstaff, AZ (845)
Fort Myers (1)
George Henry Peters (2)
George W. Ritchey (169)
Glass Palte (1)
Glass Plate (201)
Glass Plates (79)
Great Equatorial (2)
Grounds (5)
History Of Science (1)
HMNAO (1)
Home (2)
House (4)
Ink Spot (1)
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Planets (4)
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Portrait (1)
Prin Transit Instrument (1)
Professor (2)
Radio Cabinet (1)
Radio Station Towers (1)
Reflecting Telescope (169)
Reflector Telescope (845)
Refractor (2)
Sailors (1)
Scientific Expeditions (92)
Scientific Instruments (1)
Shortt-Synchronome Clock (1)
Shortt–Synchronome Clock (1)
Skinner (1)
Solar Eclipse (19)
Staff (6)
Submarine (1)
Sunspot (2)
Sunspot Curves (1)
Survey (1)
Switchboard (3)
Tail Piece (1)
Telescope (26)
Telescope Dome (846)
Telescope Lens (1)
Time Service (16)
Total Solar Eclipse (92)
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Transit Instrument (9)
Transmitting Clock (1)
UCAC (1)
United States Navy (1)
USNO (197)
USNO, Washington DC, Glass Plate (1)
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Warner And Swasey (1)
Washington DC (7)
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