Geological Survey (U.S.) creator text dcu Washington 1952 monographic eng

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iii, 18 p. illus., diagrs. 27 cm. prepared by the Topographic Division, Research and Technical Control Branch, Section of Photogrammetry. "The text of this circular is an adaptation and combination of the following papers: 1. Hopkins, B. T., 1951, The Twinplex plotter for low-oblique photography. [Unpublished] 2. Radlinski, W. A., 1952, Convergent low-oblique photography and its application to the Twinplex: Photogrammetric engineering, v. 18, no. 3, pp. 596-597. 3. Thompson, M. M., 1950, the Twinplex, a new stereoplotting instrument; U. S. Geological Survey Circ. 82." Photographic surveying Surveying Instruments QE75 .C5 no. 222 526.91 526.98* gs 53000080 U. S. Geol. Survey. Libr. 850718 20260227111359.0 gs 53000080