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Image: Americana 1920 Mineralogy - Valuable Minerals

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Description: 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.
Title: Americana 1920 Mineralogy - Valuable Minerals
Credit: Encyclopedia Americana, v. 19, 1920, facing p. 166.
Author: F. E. Wright
Permission: This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923. Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. PD-1923 Public domain in the United States //commons.wikimedia.org/wiki/File:Americana_1920_Mineralogy_-_Valuable_Minerals.jpg
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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