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  1. Astronomical observations made at Hudson Observatory, latitude 41 ̊14' 42".6,north, and longitude 5

    ...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...

    https://library.si.edu/digital-library/book/astronomicalobs00loom

  2. Astronomical observations made at Hudson Observatory, latitude 41° 14' 37" north, and longitude 5h.

    ...(CC0 1.0) This content is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this...

    https://library.si.edu/digital-library/book/astronomicalobse00loom

Showing results 1 - 2 of about 2 for copyright
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