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Album caption and index card: Twinplex stereoscopic plotter for transverse and convergent photography. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. December 1955.
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Album caption: Snake River Canyon. W.R. Cheneweth, Topographer. 1920. No index card.
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Album caption: Long bar with multiplex projectors. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. 1955. No index card.
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Album caption: Twinplex and Russell K. Bean, room 106. Portrait. No index card.
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Album caption: Single pair of multiplex projectors for stereoscopic plotting. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. December 1955. No index card.


    map background search result map search result map Long bar with multiplex projectors, Denver, Colorado. 1955. Single pair of multiplex projectors, Denver, Colorado. 1955. Twinplex stereoscopic plotter, Denver, Colorado. 1955. Long bar with multiplex projectors, Denver, Colorado. 1955. Single pair of multiplex projectors, Denver, Colorado. 1955. Twinplex stereoscopic plotter, Denver, Colorado. 1955.