Policke, T.A.; Bryant, M.F. & Spencer, R.B. Defense Waste Processing Facility prototypic analytical laboratory, article, January 1, 1991; (https://digital.library.unt.edu/ark:/67531/metadc1097608/m1/2/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .