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- Postcards--Collectors and collecting437
- Astronomy--United States--Observations358
- Astronomy--Observations79
- Astronomical instruments32
- Telescopes22
- Clark, Alvan Graham, 1832-18974
- Alvan Clark & Sons2
- Astronomy--United States--Observations.2
- Micrometers (Instruments)2
- Postcards--Collectors and collecting.2
- Fitz, Henry, 1808-18631
- Spectroscope1