TY  - RPRT
TI  - Map showing location of sand, gravel, and till pits and quarries in the Hampden quadrangle, Massachusetts-Connecticut
AU  - Roger B. Colton
AU  - Michael J. Mallory
PY  - 1968
DO  - 10.3133/ofr6957
UR  - https://pubs.usgs.gov/publication/ofr6957
ID  - ofr6957
ER  -