div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=usgs-the-usefulness-or-the-informtlon-that-obtained-check-points-bhm-ao-blackhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: USGSthe usefulness or the informtlon that obtained check points Bhm ao black circles on the profile whose positions are accurately known were plotted and the intervening profile loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentsusreader035viewer20220708175f121a895df0a121d111e694html5thumbnails1jpg width=140 height=200 divdiv
