TY  - RPRT
TI  - Investigations of the principal fluorspar districts of Mexico
AU  - Ralph Erskine Van Alstine
AU  - Samuel Estrada
AU  - Ernesto de la Garza
PY  - 1963
DO  - 10.3133/ofr63124
UR  - https://pubs.usgs.gov/publication/ofr63124
ID  - ofr63124
ER  -