TY  - RPRT
TI  - Geologic map of the Blackey 7 1/2-minute Quadrangle, Knott and Letcher counties, Kentucky
AU  - Henry A. Waldrop
PY  - 1976
DO  - 10.3133/ofr76234
UR  - https://pubs.usgs.gov/publication/ofr76234
ID  - ofr76234
ER  -