EIchelberger, J.F.; Grove, G.R. & Jones, L.V. Mound Laboratory Progress Report for December, 1964, report, December 21, 1964; (https://digital.library.unt.edu/ark:/67531/metadc930121/m1/29/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, digital.library.unt.edu; .