TY  - RPRT
TI  - Aeromagnetic map of the Westford quadrangle, Middlesex County, Massachusetts
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1971
DO  - 10.3133/gp742
UR  - https://pubs.usgs.gov/publication/gp742
ID  - gp742
ER  -