Mules Towing Boat Down Lehigh, C.1920s
H. Armstrong Roberts/ClassicStock
Horse-drawn Canal Boat, C.1960s
G Hampfler and ClassicStock
Mount Rushmore Construction Site, 1930a
Science Source
Klondike Gold Rush, Chilcoot Pass, 1898
Science Source
Klondike Gold Rush, Chilcoot Pass, 1898 #1
Science Source
Klondike Gold Rush, Chilcoot Pass, 1898 #2
Science Source
Chicago, Union Stock Yard, 1926
Science Source
Chuckwagon And Cowboys, 1907
Science Source
Klondike Gold Rush, Grand Pacific
Science Source
Chuckwagon And Cowboys, 1905
Science Source