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Google Analytics Dashboard for Twenty-first annual report of the Director of the United States Geological Survey, 1899-1900: Part I - Director's report, including triangulation, primary traverse, and spirit leveling

Twenty-first annual report of the Director of the United States Geological Survey, 1899-1900: Part I - Director's report, including triangulation, primary traverse, and spirit leveling

URI: https://pubs.usgs.gov/publication/ar21_1

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