Wealth in depth, the minerals of Kansas

"Kansas is generally recognized as an agricultural state, a statement founded on fact; however, raw materials not classified as agricultural have made a notable contribution to the state's economy. Since the time of early statehood their importance has steadily increased with every indication that maximum values will continue to advance for a considerable period. These nonagricultural products, the state's minerals, fall into three general classifications: heat energy sources, metallics, and non-metallics. Any one of these in the quantities present in Kansas would be valuable to the economy of a state but when all three are present in commercial quantities the state takes its place as a leader among the mineral producers of the nation."