Montana ( Valley county) porcupine valley surveyed in 1909-1910

By: Contributor(s): Material type: MapMapPublication details: Washinngton US Geological Survey 1918Description: 1 Map Coloured 52 x 42 cmGenre/Form: DDC classification:
  • 912.786
Summary: Datum is mean sea levelSummary: Approximate mean sea declination, 1916
Item type: Maps
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Datum is mean sea level

Approximate mean sea declination, 1916