Steel plow
"Oregon Trail." Columbia Electronic Encyclopedia, 6Th Edition (2013): 1. History Reference Center. Web. 2 Oct. 2014.
Blashfield, Jean F. "The Route Out Of Missouri." Santa Fe Trail (2000): 7-8. History Reference Center. Web. 2 Oct. 2014.
See J. M. Faragher, Women and Men on the Overland Trail (1979); D. L. Smith, ed., Survival on a Westward Trek (1989).
Blashfield, Jean F. "The Route Out Of Missouri." Santa Fe Trail (2000): 7-8. History Reference Center. Web. 2 Oct. 2014.
See J. M. Faragher, Women and Men on the Overland Trail (1979); D. L. Smith, ed., Survival on a Westward Trek (1989).