Long bar with multiplex projectors. Denver, Colorado. 1955.

Album caption: Long bar with multiplex projectors. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. 1955. No index card.

Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Jefferson County, Colorado, Photographers, Topography, Walker, W.C. Collection, photo print

Members of the Petroleum Geology Colloquium. Denver, Colorado. 1957.

Album caption and index card: Members of the Petroleum Geology Colloquium, organized by Fuels Branch Petroleum Geology Laboratory. From left to right: W.R. Keefer, A.T. Myers, A.D. Zapp, P.W. Richards, Leonard Harris, Jack E. Schoellhamer, Wallace de Witt Jr., Curt Teichert, E.E. Glick, W.D. Johnson, Jr., George O. Bachman, L.B. Riley, John E. Johnston, Robert Brown. U.S. Geological Survey. Denver, Colorado. May 15, 1957.

Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Denver, Colorado, Fuels Branch Collection, Photographers, Portraits, Portraits Collection, All tags... Walker, W.C. Collection, photo print, Fewer tags

Twinplex stereoscopic plotter, Denver, Colorado. 1955.

Album caption and index card: Twinplex stereoscopic plotter for transverse and convergent photography. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. December 1955.

Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Jefferson County, Colorado, Photographers, Topography, Walker, W.C. Collection, photo print

Single pair of multiplex projectors. Denver, Colorado. 1955.

Album caption: Single pair of multiplex projectors for stereoscopic plotting. Photogrammetry, Topographic Division, U.S. Geological Survey. Denver, Colorado. December 1955. No index card.

Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Jefferson County, Colorado, Photographers, Topography, Walker, W.C. Collection, photo print