TY  - RPRT
TI  - Aeromagnetic map of the Fitchburg quadrangle, Worcester County, Massachusetts
AU  - Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey
PY  - 1971
DO  - 10.3133/gp739
UR  - https://pubs.usgs.gov/publication/gp739
ID  - gp739
ER  -