History of the Union Pacific coal mines, 1868 to 1940 ...
APA Citation
[Union Pacific coal company]. (1940). History of the Union Pacific coal mines, 1868 to 1940 ... Omaha, Neb.: The Colonial Press.
MLA Citation
[Union Pacific coal company]. History of the Union Pacific Coal Mines, 1868 to 1940 ... Omaha, Neb.: The Colonial Press, 1940.
Warning: These citations may not always be complete (especially for serials).