Eichelberger, J.F.; Grove, G.R. & Jones, L.V. Mound Laboratory Progress Report for December 1963, report, December 31, 1963; (https://digital.library.unt.edu/ark:/67531/metadc871838/m1/1/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .