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The manufacture of earth colours (1921)
Bersch, Josef, 1840-1907, Bersch, Wilhelm, 1868-1918, Salter, Charles · London, Scott, Greenwood, & Son, New York, D. Van Nostrand Company · leaf 68
PREPARATION OF THE COLOUR EARTHS 53Pigments · Coloring matter
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
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