Keywords: Grand Canyon. The heaviest single drop on the river. 34 3-4 feet according to Stone in 1910. (80 - NARA - 517810.tif Local identifier 57-PS-449 War Department Office of the Chief of Engineers Powell Survey 1869 - ca 1874 NARA-Author Beaman E O Elias Olcott 1837-1876 Photographer 8464436 <br /> Fennemore James 1849-1941 Photographer 8464442 <br /> Hillers John K 1843-1925 Photographer 3028457 <br /> Still Picture Records Section Special Media Archives Services Division NWCS-S National Archives at College Park 8601 Adelphi Road College Park MD 20740-6001 1871 - 1878 Record group Record Group 57 Records of the U S Geological Survey 1839 - 2008 Record group ARC 386 Photographs taken by John K Hillers during the Powell Survey and other Geological Surveys compiled ca 1879 - ca 1900 Series ARC 517734 Variant control numbers NAIL Control Number NWDNS-57-PS-449 General notes Scope and content File unit File unit ARC yes <gallery> File Grand_Canyon _The_heaviest_single_drop_on_the_river _34_3-4_feet_according_to_Stone_in_1910 _ 80_feet_by_early _-_NARA_-_517810 tif tif File Grand_Canyon _The_heaviest_single_drop_on_the_river _34_3-4_feet_according_to_Stone_in_1910 _ 80_feet_by_early _-_NARA_-_517810 jpg jpg </gallery> NARA-cooperation PD-USGov John K Hillers Grand Canyon NARA TIF images with categorized JPGs |