Aeromagnetic map of the Marlboro quadrangle, Middlesex and Worcester Counties, Massachusetts
By: compiled by the U.S. Geological Survey ; prepared in cooperation with the Commonwealth of Massachusetts Department of Public Works.
Contributors: Massachusetts. Dept. of Public Works.
Series: Geophysical investigations map -- GP-673.; Geophysical investigations (Geological Survey (U.S.)) -- GP-673.
Publisher: U.S. Geological Survey
Place of publication: Washington, D.C
Format: Map
Subjects: Geomagnetism -- Massachusetts -- Middlesex County -- Maps.; Geomagnetism -- Massachusetts -- Worcester County -- Maps.
Genres: Maps.
Other titles: Marlboro quadrangle, Middlesex and Worcester Counties, Massachusetts.
Notes: "Flown at 400 feet above ground, 1966."

Includes index map.