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online media
  • Finding aids
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  • Architectural drawings
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  • Architectural drawings
  • Archival materials
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  • Drawings
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  • Astronomical photography
  • Astrophysics
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  • Spectrometer
  • Astronomical photography
  • Astrophysics
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  • Spectrometer
name
  • Smithsonian Astrophysical Observatory. Central Engineering Department
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  • 1970s
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  • Smithsonian Institution Archives