Joseph S. Duval1 and Stephen L. Snyder1
1U.S. Geological Survey, MS 954, 12201 Sunrise Valley Drive, Reston, VA 20192
U.S. Geological Survey Open-File Report 2005-1435
Photograph of gamma-ray calibration pad facility at Physics Bldg on USGS site
in Reston, Virginia. Pads NPL and NPH were not in place at the time this picture was taken.
[an error occurred while processing this directive]