Prairie
This digital collection integrates two collections from the holdings of the Nebraska State Historical Society, the Solomon D. Butcher photographs and the letters of the Uriah W. Oblinger family.
http://memory.loc.gov/ammem/award98/nbhihtml/pshome.html

The Northern Great Plains, 1880-1920: Photographs from the Fred Hultstrand and F.A. Pazandak Photograph Collections
http://memory.loc.gov/ammem/award97/ndfahtml/ngphome.html

The First American West: The Ohio River Valley, 1750-1820
http://memory.loc.gov/ammem/award99/icuhtml/fawhome.html