00829cam a22002411 4500 gs 49000232 DLC 20260227111355.0 850718s1949 dcua f000 0 eng c gs 49000232 (OCoLC)12279857 U. S. Geol. Survey. Libr. TxHR DLC premarc QE75 .C5 n. 57 Geological Survey (U.S.) State coordinates and polyconic maps. Some notes on the state plane-coordinate systems and their relation to polyconic quadrangle maps. Prepared by Topographic Division, Research and Technical Control Branch. Washington, 1949. 7 p. illus. 27 cm. Geological Survey circular no. 57 Cover title. Map projection. Cartography. 28398 28398