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  1. A treatise on portrait painting from life. Also, instructions for painting upon photographs ... supp

    ...(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/treatiseonport00hayn

  2. The separation of gases and gaseous isotopes by means of the ultracentrifuge

    ...(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/separationgases00hayn

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