|Title note:||US Bureau of Mines, 1928-1940|
|Online content:||Free online material via The Online Books Page|
|First renewed issue:||no issue renewals found in CCE|
|First renewed contribution in:||no contribution renewals found in CCE|
This is a US government publication.
|Page responsibility:||John Mark Ockerbloom (ockerblo (at) pobox (dot) upenn (dot) edu)|
|Acknowledgement:||Thanks to Kelsey LeClair for copyright research on this title.|
|Last updated:||August 12, 2021|
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