TY  - RPRT
TI  - Grain-size analyses of Ordovician sandstones from the Midwestern states
AU  - Keith Brindley Ketner
PY  - 1979
DO  - 10.3133/ofr79230
UR  - https://pubs.usgs.gov/publication/ofr79230
ID  - ofr79230
ER  -