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Technical Memorandum File and Literature Review <br />P125 Gravel Mine Project, Weld County, Colorado <br /> <br /> <br />ERO Project #24-180 5 <br />ERO Resources Corporation <br /> 1957 Greeley 1:125000 Topographic Quadrangle Map. U. S. Surveyor General’s Office. <br /> <br />U.S. Surveyor General’s Office <br /> 1949 Gowanda 1:24000 Topographic Quadrangle Map. U. S. Surveyor General’s Office. <br />