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The Federal Aid Highway System progress map : [Minnesota] minnesota

1937. United States. Bureau of Public Roads. Geological Survey (U.S.). Cartographic Details: Scale 1:500,000 ; Modified polyconic projection (W 97‚Å∞15 π--W 89‚Å∞30 π/N 49‚Å∞23 π--N 43‚Å∞30 π). Sheets numbered 23NE, 23...

2.
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The Federal Aid Highway System progress map : [Minnesota] minnesota

1927. United States. Bureau of Public Roads. Geological Survey (U.S.). Cartographic Details: Scale 1:500,000 ; Modified polyconic projection (W 97‚Å∞15 π--W 89‚Å∞30 π/N 49‚Å∞23 π--N 43‚Å∞30 π). Sheets numbered 23NE, 23...

3.
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The Federal Aid Highway System progress map : [Minnesota] minnesota

1933. United States. Bureau of Public Roads. Geological Survey (U.S.). Cartographic Details: Scale 1:500,000 ; Modified polyconic projection (W 97°--W 90° / N 48°--N 44°). Sheets numbered 23NE, 23NW, 23SE, and 23SW...