TY  - RPRT
TI  - The Mississippian and Pennsylvanian (Carboniferous) systems in the United States
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1979
DO  - 10.3133/pp1110al
UR  - https://pubs.usgs.gov/publication/pp1110AL
ID  - pp1110AL
ER  -