Dee ihe na-aga n'ihu na paragraf a - Hammond nwetara ọrụ mbụ ya dị ka ọkachamara pụrụ iche maka US Geological Survey 1879-1880 na Washington, DC. Ọ laghachiri California na 1881 ịrụ ọrụ maka Senator George Hearst, onye isi na-egwupụta akụ na ụba na nna William Randolph Hearst. Na 1882, e zigara ya n'ala Mexico nke na-emegide Mexico, nke dị nso na Sonora, ịbụ onye nlekọta nke Minas Nuevas. Mgbe mgbanwe
Hammond kpọchiri ezinụlọ ya n'obere ụlọ ma lụso ndị agha ahụ na-awakpo ha ọgụ.