Robuta

https://hawkmtnlabs.com/
soil watersolid fuelfieldsamplingenvironmental
https://www.loc.gov/item/2005625145/
Shows parts of Tazewell County, Virginia and Mercer County, West Virginia. Pen-and-ink, mounted on cloth. LC Civil War maps (2nd ed.), H238 Available also...
the greatflat topcoal fieldmappart
https://www.usgs.gov/publications/results-test-drilling-and-hydrogeology-capps-coal-field-alaska
No abstract available.
coal fieldresultstestdrillinghydrogeology