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  • Color image map : [ports of entry, United States-Canadian border] /

    Scale 1:25,000. Each sheet separately titled. "Projection and 1000-meter grid: Universal Transverse Mercator." "Photoimagery rectified by optical scanning of simultaneously exposed B/W panchromatic and B/W infrared 1:70,000 scale aerial photographs taken October ...

    • Contributor: Geological Survey (U.S.)
    • Original Format: Maps
    • Date: 1978