connected up railroads in IL using Bing imagery
extended railroads in IL using Bing
added Fort Massac in Illinois using usgs 3dep, Bing imagery, wikipedia
added Fort de chartres in Illinois using usgs 3dep, wikipedia
extended railroads in IL using Bing, added places using Wikipedia; USGS Topo
connected up railroads in IL using Bing imagery
added fort Kaskasia, Lusk's Ferry road per wikipedia description, usgs 3dep, usgs topo
connected up railroads in IL using Bing imagery and added places using USGS topo, wikipedia
connected up railroads in IL using Bing imagery and added places using USGS topo, wikipedia
extended railroads in IL using usgs topo, Bing, Usgs 3dep
connected up railroads in IL using Bing imagery, USGS 3DEP
extended railroads in IL using usgs topo, Bing, Usgs 3dep
extended railroads in IL using usgs topo
extended railroads in IL using usgs topo
extended railroads in IL using Bing
extended railroads in IL using usgs topo
extended railroads in IL using usgs topo
extended railroads in IL using usgs topo, Bing
extended railroads in IL using usgs topo
extended railroads in IL using usgs topo, usgs 3dep