TY  - RPRT
TI  - Geology and mineral paragenesis of the Pea Ridge iron ore mine, Washington County, Missouri: Origin of the rare-earth-element- and gold-bearing breccia pipes. Some mineralogical and geochemical aspects of middle and upper Pennsylvanian marine black shales in part of the midcontinent region. Mineralogical and geochemical analysis of the metal- and organic-rich Grassy Creek Shale of the New Albany group (Upper Devonian and Lower Mississippian) in Hardin County, southern Illinois
AU  - L. M. Nuelle
AU  - Warren C. Day
AU  - Gary B. Sidder
AU  - Cheryl M. Seeger
AU  - George A. Desborough
AU  - Joseph R. Hatch
AU  - Joel S. Leventhal
PY  - 1992
DO  - 10.3133/b1989ac
UR  - https://pubs.usgs.gov/publication/b1989AC
ID  - b1989AC
ER  -