TY  - RPRT
TI  - Observation of a "front" of regional metamorphism
AU  - Rene Perrin
AU  - Marcel Roubault
AU  - S. H. Britt
PY  - 1953
DO  - 10.3133/ofr5432
UR  - https://pubs.usgs.gov/publication/ofr5432
ID  - ofr5432
ER  -