TY  - RPRT
TI  - Geologic map of the Hellier quadrangle, Kentucky-Virginia and part of the Clintwood quadrangle, Pike County, Kentucky
AU  - Donald Clayton Alvord
PY  - 1971
DO  - 10.3133/gq950
UR  - https://pubs.usgs.gov/publication/gq950
ID  - gq950
ER  -