The Kansas Territory 1854-1961 by William A Martin. The market Kansas is very strong. This is despite a lack of a society and an out of date basic reference.
Demand seems relatively even through the state.
There is more demand for 19th Century than 20th Century. That made it one of the better states. This overheating of the market has slowed, but Kansas remains strong. The collector base for Kansas has advanced and aged. This has softened demand as few new collectors have started this state.