Eichelberger, J.F.; Grove, G.R.; Jones, L.V. & Rembold, E.A. MOUND LABORATORY PROGRESS REPORT FOR MARCH 1963, report, March 30, 1963; (https://digital.library.unt.edu/ark:/67531/metadc867731/m1/1/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .