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Oxidized Zinc Deposits <br />of the United States <br />Part 3. Colorado <br />By ALLEN V. HEYL <br />GEOLOGICAL SURVEY BULLETIN 1135 -C <br />The geology of the known deposits <br />and the resources of oxidized zinc <br />ores in Colorado <br />UNITED STATES- GOVERNMENT PRINTING OFFICE, WASHINGTON : 1964 <br />