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Triangulation and Traverse Sketches to Accompany Report International Boundary Commission

其他書名	Reestablishment of the Boundary Between the United States and Canada. Northwesternmost Point of Lake of the Woods to Lake Superior
出版	U.S. Government Printing Office, 1931
URL	http://books.google.com.hk/books?id=bilyGQAACAAJ&hl=&source=gbs_api