TY  - RPRT
TI  - Map showing distribution pattern of tin from samples of the nonmagnetic fraction of heavy-mineral concentrates, northern Sonora, Mexico
AU  - James G. Frisken
AU  - R. L. Turner
AU  - T. M. Billings
AU  - Guillermo Monroy
AU  - Benjamin Ponce
PY  - 1977
DO  - 10.3133/ofr77331
UR  - https://pubs.usgs.gov/publication/ofr77331
ID  - ofr77331
ER  -