TY  - RPRT
TI  - Report of the Geological Exploration of the Fortieth Parallel, Volume VI: Microscopical petrography
AU  - Ferdinand Zirkel
AU  - Clarence King
PY  - 1876
DO  - 10.3133/70039233
UR  - https://pubs.usgs.gov/publication/70039233
ID  - 70039233
ER  -