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Machinists and blacksmiths' monthly journal v. 8 no. 6 Apr. 1871
...(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/machinistsblack861871fehr
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Machinists and blacksmiths' monthly journal v. 8 no. 8 June 1871
...(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/machinistsblack881871fehr
