1 map : color ; 45 x 37 cm Publisher : Philadelphia : Mitchell, S, Augustus 1792-1868 Engraver : Burroghs, H.N. Scale : 1: 1,700,000 Page 20 in a New World Atlas. Shows steamboat routes in a chart at the bottom. This atlas was the first in America to be published by lithiographic map plates instead of engraved map plates.Lower printing costs allowed for a greater productions and distribution.