div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: USGS · rb 21 28 33 gn 1 001 18 mils rb 8185 13 27 15½0 276 mils rb r85 02 017 32 45015 106030 base from us geological survey 1966 5000 6000 1 44 e 2000 3000 4000 src=https:reader035vdocumentsfrreader035viewer20220630195fe0426bfd1bc738fe04d2e2html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv