TY  - RPRT
TI  - Preliminary report on the geology and mineralogy of clays on the Pine Ridge Indian Reservation, South Dakota, with a chapter on usability tests
AU  - Leonard Gene Schultz
AU  - Howard P. Hamlin
PY  - 1961
DO  - 10.3133/ofr61153
UR  - https://pubs.usgs.gov/publication/ofr61153
ID  - ofr61153
ER  -