Walter Henry 1892- Voskuil

• Coke from Illinois Coals; Illinois State Geological Survey Bulletin No. 64
• Geology and Mineral Resources of the Marseilles, Ottawa, and Streator Quadrangles; Illinois State Geological Survey Bulletin No. 66
• Illinois Mineral Industry In 1934
• Illinois Mineral Industry In 1936
• Illinois Mineral Industry In 1937
• Illinois Mineral Industry In 1938
• Illinois Mineral Industry In 1939
• Illinois Mineral Industry in 1942; Report of Investigations No. 94
• Illinois Mineral Industry in 1947; Report of Investigations No. 140
• Illinois Mineral Industry in 1948; Report of Investigations No. 147
• Illinois Mineral Industry in 1950; Report of Investigations No. 158
• Market for Illinois Oil in 1937 and 1938; Report of Investigations No. 54