File:Americana 1920 Mineralogy - Valuable Minerals.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:59, 5 October 2012		1,415 × 2,127 (385 KB)	Bob Burkhardt	{{Information \|Description={{en\|A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite.}} \|Source=''Encyclopedia Americana'', v. 19, 1920, facing p. 166. \|Date=1912...

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