1. Summer was one of Powell's chief aids in his first expedition - a man of high character and Creator: Beaman, E. O Call Number: WA Photos 271 Collection Title: Frederick Samuel Dellenbaugh collection of photographs and drawings of the Colorado River region. Container / Volume: Box 7 | Folder 171 Image Count: 2 Resource Type: Prints & Photographs Abstract: down the Colorado River (1871-1873); author Found in: Beinecke Rare Book and Manuscript Library > Summer was one of Powell's chief aids in his first expedition - a man of high character and efficiency - a mountain man. He spent his life in prospecting for the precious metals and died poo