TY  - RPRT
TI  - Maps showing bedrock outcrops in the Concord, Lexington, Boston North, Reading, Salem, and South Groveland quadrangles, Massachusetts
AU  - Kenneth Granville Bell
PY  - 1976
DO  - 10.3133/ofr76697
UR  - https://pubs.usgs.gov/publication/ofr76697
ID  - ofr76697
ER  -