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- Albert Einstein
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- Arizona State College
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- bibliography
- C. O. Lampland
- calf
- California Institute of Technology
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- Clark Telescope
- Clyde Tombaugh
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- E.C. Slipher
- Eastburn Lacy
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- Edwin Francis Carpenter
- Edwin Hubble
- Elizabeth Roemer
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- Harlow Shapley
- Harold Knox-Shaw
- Heber Doust Curtis
- John H. Reynolds
- Knut Lundmark
- Lampland C.O.
- Lick Observatory
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- Lowell
- Lowell Observatory
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- Mars
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- New Horizons
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- Newsletter
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- Otto Struve
- Percival L.
- Percival Lowell
- Pluto
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- Red Shift
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- Slipher Emma
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- spectrograph
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- Sykes Stanley
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- V.M. Slipher
- velocity
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- Will
- Women
- Yerkes Observatory