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<br />. <br /> <br />United States Department of the Interior <br />W ALTER J. HICKEl, Secretary <br /> <br />Ad/MTO}'''< <br />/~.~.'."."\It ..>U.....\ <br />It.'t; ~,~, <br />?"'.f"II~../. .....c_.'.' ....... ......\....\,'.. <br />l'OI,i_~ ",,-,," :'-<...'\'['\\ <br />1(..1', ...... ,.,.... :~Ii <br />I, .f-: ,/0,1 <br />\~?:'~~-" - _8[-- 0:,;' ':'}~: <br />"A~ ..',' <br />~"9~~"/ <br />~r9 <br /> <br />Geological Survey <br />William T. Pecora, Director <br /> <br />. <br /> <br />"X' <br /> <br />Free on application to the U.S. Geological Survey, Washington, D.C 20242 <br /> <br />. <br />