TY  - RPRT
TI  - Aeromagnetic map of the Mount Grace quadrangle and part of the Northfield quadrangle, Franklin and Worcester Counties, Massachusetts, and Cheshire County, New Hampshire
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1971
DO  - 10.3133/gp726
UR  - https://pubs.usgs.gov/publication/gp726
ID  - gp726
ER  -