TY  - BOOK
ED  - Geological Survey (U.S.)
TI  - Twin low-oblique photography and the Twinplex plotter,
AV  - QE75 .C5 no. 222
U1  - 526.91526.98* 
PY  - 1952///
CY  - Washington
KW  - Photographic surveying
KW  - Surveying
KW  - Instruments
N1  - "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 [Unpublished] 2.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."
ER  -