added murphysboro, IL and fixed approx. railroad end dates
extended railroads in IL using usgs 3dep
fixed fixme for creek name using usgs topo
extended railroads in IL using Bing imagery
extended Skunk river, Iowa, using Bing Imagery
extended Skunk river using USGS Topo
extended North river using Bing imagery
extended North river using Bing imagery
extended North river using Bing imagery
conmected up middle racoon river using Bing, USGS Topo
connected up Soldier River using Bing
extended Middle Raccoon river using Bing imagery
extended Middle river using Bing imagery
extended North river using Bing imagery
extended North river using Bing imagery
connected up Des Moines River through reservoir using usgs topo
added missing start/end dates of railroad
extended railroads in OH using USGS Topo and Bing imagery
connecting up railroad using Bing, adding missing start date
extended Lincoln Highway into IL usings Bing, USGS Topo