TY  - RPRT
TI  - Geology and refractory clay deposits of the Haldeman and Wrigley quadrangles, Kentucky, with a section on coal resources
AU  - Sam H. Patterson
AU  - John W. Hosterman
AU  - John Warfield Huddle
PY  - 1962
DO  - 10.3133/b1122f
UR  - https://pubs.usgs.gov/publication/b1122F
ID  - b1122F
ER  -