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

Keyword Search

The international systems of hard-coal classification and their application to American coals

Published Year

• 1950-1959 (1) *

Subject

• Coal--Classification (1)

Author

• Frederic, W. H. (1) *
• Ode, W. H. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

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