Watson, D.; Leavitt, M. & Moss, D. Bear Creek Valley characterization area mixed wastes passive in situ treatment technology demonstration project - status report, article, March 1, 1997; (https://digital.library.unt.edu/ark:/67531/metadc676454/m1/1/: accessed July 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .