Color image maps : [ports of entry, United States-Canadian border] /
Geological Survey (U.S.)
Canada.Department of Energy, Mines and Resources.
U.S. Customs Service.
Reston, Va. : U.S. Geological Survey,
1977-
Each sheet separately titled, e.g., Alburg Springs Station, Vermont-Québec color image map.
Other title information supplied by cataloger.
"Photoimagery rectified by optical scanning of simultaneously exposed B/W panchromatic and B/W infrared 1:70,000-scale aerial photographs taken October 28, 1975, by the Department of Energy, Mines and Resources, Ottawa, Ontario, Canada."
Includes diagram of "Adjoining color image maps."
Ports of entry
Ports of entry
United States.
Canada.