Texas (Harris county) Swanson Quadrangle Surveyed in 1915-1916 in Cooperation with the Harris County

By: Contributor(s): Material type: MapMapPublication details: Washington US Geological Survey 1919Description: 1 Map Coloured 52 X 42 cmGenre/Form: DDC classification:
  • 912.764
Summary: Datum Is Mean Sea LevelSummary: Approximate Mean Declination, 1915
Item type: Maps
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Datum Is Mean Sea Level

Approximate Mean Declination, 1915