Creep in model pillars. [Salt, trona, and potash ore]
Creep in model pillars. [Salt, trona, and potash ore], report, March 1, 1965; United States. (https://digital.library.unt.edu/ark:/67531/metadc1418222/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.