div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=pubsusgsgov-united-states-department-of-the-interior-geological-survey-f-f-x-4620htmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: pubsusgsgovunited states department of the interior geological survey f f x 4620 —065 explanation 65 85 s 85 approximate mean declination 1963 80 f 80 loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader034vdocumentinreader034viewer20220422075ea9ed39337a82087e34ce61html5thumbnails1jpg width=140 height=200 divdiv