Petroleum Investigations and Production of Helium
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Petroleum Investigations and Production of Helium, report, June 1919; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc38752/: accessed April 26, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.