Image: Fleta Minor copper assay
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Description: Illustration on copper assaying from Fleta Minor (1683) by John Pettus.
Title: Fleta Minor copper assay
Credit: http://library.brown.edu/exhibit/archive/files/05f9c4bbf31fdae128529ad197ca305d.jpg
Author: Unknown engraver
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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