Search U.S. government technical reports digitized or harvested by TRAIL.

Keyword Search

A study of roof in Pennsylvania mines contiguous to Monongahela River

Published Year

• 1930-1939 (1) *

Subject

• Coal mines and mining--Pennsylvania--Pittsburgh (1)

Author

• Calverley, J. G. (1) *
• Paul, J. W. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

Search developed and maintained by the University of Washington Libraries
Copyright 2010