TY  - RPRT
TI  - Bedrock geologic map of Massachusetts
AU  - N. M. Ratcliffe
AU  - Peter Robinson
AU  - R. S. Stanley
PY  - 1981
DO  - 10.3133/ofr811327
UR  - https://pubs.usgs.gov/publication/ofr811327
ID  - ofr811327
ER  -