Patriarca, P. & Rucker, D.J. (ed.))nt of DUCE POPULATI. FUELS AND MATERIALS DEVELOPMENT PROGRAM QUARTERLY PROGRESS REPORT FOR PERIOD ENDING MARCH 31, 1970., report, January 1, 1970; (https://digital.library.unt.edu/ark:/67531/metadc864724/m1/1/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .