TY  - RPRT
TI  - Preliminary report on the paleontology of the Black Hills, containing descriptions of new species of fossils from the Potsdam, Jurassic, and Cretaceous formations of the Black Hills of Dakota
AU  - R.P. Whitfeild
AU  - John Wesley Powell
PY  - 1877
DO  - 10.3133/70039915
UR  - https://pubs.usgs.gov/publication/70039915
ID  - 70039915
ER  -