Abbreviations and explanations used in the diagrams.
Cascade Division
Chicago Division
Fargo Division
LaCrosse Division
Lake Superior Division
Minnesota Division
Minot Division
Montana Division
Pacific Division
Pasco Division
Portland Division
Spokane Division
Alliance Division
Denver Division
Galesburg Division
Lincoln Division
McCook Division
PowderRiver Division
Wilmar Division
Yellowstone Division
Amarillo Division
Ft Worth Division
Kansas City Division
Memphis Division
River Division
Springfield Division
Tulsa Division