Search U.S. government technical reports digitized or harvested by TRAIL.
Computer methods of fitting surfaces to assay and other data by regression analysis
Microfilming maps of abandoned anthracite mines :mines of the eastern middle field
Microfilming maps of abandoned anthracite mines :mines in the Western middle anthracite field
The mine map repository - a source of mine map data.
Applying computer-drawn maps of geologic data to analysis of mining problems