832-136220 - Beware of poisonous snakes, sign at a rest stop on Interstate 90 at a hiking trail above the Missouri River, Chamberlain, South Dakota, USA
857-33139 - A fieldworker sharpens shovels the old fashioned way at the Big Eddy, an Archaeological site on the Sac River in southwestern, MO. Archaeologist Neal Lopinot from Missouri State University has been digging their since 1997 to gain a more complete understanding of the prehistoric record in North America. (Photo by David McLain, Aurora)