detail from Bering Sea nautical Chart
US Office of Coadt Survey, NOAA
Historical Maps and Charts Project <a rel="nofollow" class="external free" href="http://historicalcharts.noaa.gov/tiled_jpgs_done/zoomifyURLDrivenWebPage.htm?zoomifyImagePath=16006-12-2000">http://historicalcharts.noaa.gov/tiled_jpgs_done/zoomifyURLDrivenWebPage.htm?zoomifyImagePath=16006-12-2000</a>