div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: USGS · 2011-04-08 · usaf3 19 54 15 t 0103 meters 650 600 550 500 mcl7 1984 to 320 feet 2200 2150 2100 2050 2000 1950 1900 1850 1800 1750 1700 165c 1600 meters 650 600 550 500 src=https:reader034fdocumentsusreader034viewer20220501185f4e544eb5d39f74f630fd5chtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv