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A TEXT-BOOK OF ASSAYING: 1904
http://www.gutenberg.org/files/18751/18751-h/18751-h.htm
Blowpipe
Fire (Dry) assays
Torch Assaying
Thermite
Chemical (wet) assays
Microchems
Specific Gravity
Toothpick Assay
Vreeland Spectroscope
Discovery
Assaying WWW’s
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