Plss Map

http://nationalatlas.gov/articles/boundaries/a_plss.html

The map above is a PLSS map of the united states, dividing each state into town meridians with the use of base lines. It qualifies as a PLSS map due to each townships being surveyed north, south, east and west from a certain point. The township designations indicate the location north or south of the baseline, while the range designations indicate the location east or west of the principle meridian.