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File:AdvancingLongwall.png

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Percentage of Extraction on of Bituminous Coal with Special Reference to Illinois Conditions,
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Index

File
File history
File usage
File:AdvancingLongwall.png
406 × 600 pixels
162 × 240 pixels
516 × 762 pixels
Original file
Wikimedia Commons
description page there
You can help
Engineering Experiment Station Bulletin No. 100
public domain
United States
publication
this page
rule of the shorter term
Knowledge:Public domain
Knowledge:Copyrights
depicts
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