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<br />. <br /> <br />1762 <br /> <br />u.s. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br />U.S. GEOLOGICAL SURVEY <br />Gordon P. Eaton, Director <br /> <br />" <br /> <br />.":'" "~,.,,:..;,,.:--....., <br /> <br />. <br /> <br />. ~ .~ <br /> <br />.-." .~. . ,,: : :> <br /> <br />The use of trade, product. industry, or firm names is for descriptive purposes only and does not imply <br />endorsement by the U.S. Government <br /> <br />For additional information write to: <br /> <br />Copies of this report can be purchased from: <br /> <br />District Chief <br />U.S. Geological Survey <br />Box 25046, MS 415 <br />Denver Federal Center <br />. Denver, CO 80225 <br /> <br />U.S. Geological Survey <br />Branch of Information Services <br />Box 25286, MS 517 <br />Denver Federal Center <br />Denver, CO 80225 <br /> <br />? <br /> <br />:.i <br />, " <br /> <br />3 <br />