skip to content
Search
Search U.S. government technical reports digitized or harvested by
TRAIL
.
Keyword Search
Enter your search term(s):
[advanced search]
1 result returned
Browse TRAIL Inventories
(opens in new tab)
Search results
Studies of roof movement in coal mines.
Refine your search results
Published Year
1940-1949 (1)
Subject
Coal mines and mining--Pennsylvania (1) *
Mine subsidence (1)
Author
Greenwald, H. P. (1)
Maize, Earl R. (1) *
Thomas, Edward. (1)
