Show united state states in 1 S irvey I 1 the united states Ce geological survey is Is diligently prosecuting its j cal of the united states be sides tl it e topo giai gial life sheets there ire sheets for lani an I 1 classification geology etc the file atlis sheets are and t half ba b twenty inches engraved on copper in lu 1 printed in three colors the cultural cult uial features such is roads rail ways cities etc as well is ts all letter ings aie ate blace all water features are blue ind the hill features fea tines are shown by brown contours the sheets beets can be bought for five fhe cents or in quantities for two cents cent per sheet during the last fiscal veal 35 square miles were sul ve ed in thirty two states and tories miles of levels were iun lun 1338 perman permanent crit bench marks es etc in basla square miles anele mapped up to the present time miles of the area of the united states have been sur i eyed about twenty nine per cent of its surface |