File:Cassier's Magazine - P20 Mine timbering in the united states.png

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English: Cassier's Magazine - First page illustration (P20 Mine timbering in the united states)
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Source https://en.wikisource.org/wiki/Page:Cassier%27s_Magazine_Volume_XV.djvu/32
Author John Birkinbine

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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, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Cassier%27s_Magazine_-_P20_Mine_timbering_in_the_united_states.png

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current21:52, 10 March 2021Thumbnail for version as of 21:52, 10 March 2021413 × 683 (164 KB)Sp1nd01Uploaded a work by John Birkinbine from https://en.wikisource.org/wiki/Page:Cassier%27s_Magazine_Volume_XV.djvu/32 with UploadWizard

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