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  1. The latitude of the Cambridge Observatory, in Massachusetts

    ...(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/latitudeofcambri00peir

  2. Letter

    ...(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/letter00peir

Showing results 1 - 2 of about 2 for copyright
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