Underground coal mine track inspection and cleaning vehicle /
by Richard L. Unger.
APA Citation
Unger, R. L. (1989). Underground coal mine track inspection and cleaning vehicle. Pgh [i.e. Pittsburgh] Pa.: U.S. Dept. of the Interior, Bureau of Mines.
MLA Citation
Unger, Richard L. Underground Coal Mine Track Inspection And Cleaning Vehicle. Pgh [i.e. Pittsburgh] Pa.: U.S. Dept. of the Interior, Bureau of Mines, 1989.
Warning: These citations may not always be complete (especially for serials).