TY  - RPRT
TI  - Geology of the Precambrian rocks of the Keystone pegmatite district, southern Black Hills, South Dakota
AU  - James Jennings Norton
PY  - 1957
DO  - 10.3133/ofr5784
UR  - https://pubs.usgs.gov/publication/ofr5784
ID  - ofr5784
ER  -