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(1920) Iowa Coal, October 6, 1920. Iowa State University
(1982) Annual report: Iowa State Mining and Mineral Resources Research Institute, July 1, 1981 - June 10, 1982, 1982. Iowa State University
(2008) Letter health consultation : Northwest States Portland Cement Company site, site, Mason City, Iowa EPA facility ID: IAD98053431 (2008). Public Health, Department of (Health and Human Services, Department of)
(2008) Letter health consultation : Mason City coal gasification plant site, Mason City, Iowa EPA facility ID: IAD980969190 (2008). Public Health, Department of (Health and Human Services, Department of)