The Hall County, Nebraska web site now has historical maps of Nebraska dating 1850-1901. They were scanned from atlases published between those dates. The maps have been retouched. They are colorful and informative!
Maps are online in PDF format in "Low Res" and "High Res." Of course, the "High Res" files are going to take longer to download, but the quality is much better. They can all be saved to your computer for future reference.
Originals maps are in the collections of the Nebraska State Historical Society in Lincoln, NE and the Stuhr Museum of the Prairie Pioneer at Grand Island, NE.
By using the maps you will have a good understanding about the early formation dates of the territory and state ... NEBRASKA.