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<br /><PLtb Lfs- <br />* <br /> <br />) <br />/ <br />" <br />\. <br />~ <br />'" <br /> <br />--"II:'-' 1959-60 <br /> ---~- <br />. t. * <br />~ <br />.. N <br /> 0J <br /> <br /> <br />GENERAL SERIES 757 <br /> <br />-.u.- <br /> <br />j <br /> <br />~~ <br />~~ <br /> <br /> <br />- /" ~ 'Y <br /> <br /> <br />'\\ of Colorado <br /> <br />- <br /> <br />6 -t, <br />";'~ <br /> <br /> <br /> <br /> <br /> <br />l ~ <br />i\I\ <br />, I <br />. j , <br /> <br />l) <br /> <br />~ <br /> <br />fit <br /> <br />~.'l' <br />~ <br /> <br />JUNE 1961 <br /> <br /> <br />\ <br /> <br /> <br />(J <br /> <br />~:t <br />~<I-t\' <br />PREPARED BY U. S. GEOLOGICAL SURVEY IN COOPERATION WITH "'1':i.- <br />COLORADO STATE UNIVERSITY AGRICULTURAL EXPERIMENT STATION <br />