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Two blue-colored base maps showing the Positions of Magnetic Stations and Routes of Geodetic Spirit Leveling in the United States during the year ending in June 30th, 1893.

2 blue base maps, Positions of Magnetic Stations & Routes of Leveling, 1893

SKU: 186
$50.00Price
  • Charts 6 & 7. Positions of Magnetic Stations and Routes of Geodetic Spirit Leveling. 1893.

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