TY  - RPRT
TI  - Surficial geologic map of the Pepperell quadrangle, Middlesex County, Massachusetts, and Hillsborough County, New Hampshire
AU  - Carl Koteff
AU  - Richard P. Volckmann
PY  - 1973
DO  - 10.3133/gq1118
UR  - https://pubs.usgs.gov/publication/gq1118
ID  - gq1118
ER  -