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1855-1921, A Manual of the Principal Instruments Used in American Engineering and Surveying; 1941- Gurley Manual of Surveying Instruments
Gurley, W. & L.E., Troy, N.Y.
出版W. & L.E. Gurley., 1891
URLhttp://books.google.com.hk/books?id=2poSAAAAYAAJ&hl=&source=gbs_api
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