TY  - RPRT
TI  - Preliminary map showing global distribution of alpine-type ultramafic rocks and blueschists
AU  - William P. Irwin
AU  - Robert G. Coleman
PY  - 1972
DO  - 10.3133/mf340
UR  - https://pubs.usgs.gov/publication/mf340
ID  - mf340
ER  -