Willis L. Busch

• Directory of Illinois limestone and dolomite producers
• Directory of Illinois mineral producers
• Directory of Illinois mineral producers
• Directory of Illinois sand and gravel producers
• Illinois 1962 mineral production by counties
• Illinois 1963 mineral production by counties
• Illinois mineral production by counties, 1965
• Illinois mineral production by counties, 1966
• Illinois mineral production by counties, 1968
• Illinois mineral production by counties, 1969
• Mineral production in Illinois in 1956
• Mineral production in Illinois in 1957