TY  - RPRT
TI  - Petrography of a sulfur occurrence in the Castile Formation, Southwest Texas
AU  - B.M. Madsen
AU  - O. B. Raup
PY  - 1987
DO  - 10.3133/ofr87479
UR  - https://pubs.usgs.gov/publication/ofr87479
ID  - ofr87479
ER  -