Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1934: a Preliminary Statistical Summary and Economic Review; 557 Ilre no.39

Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1948; Report of Investigations No. 147

Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1942; Report of Investigations No. 94

Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1943; Report of Investigations No. 101

Voskuil, Walter Henry 1892- An Economic Study of Fuels in Manufacturing; Report of Investigations No. 157

Voskuil, Walter Henry 1892- Minerals in World Industry; 6

Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1932: a Preliminary Statistical Summary and Economic Review; 557 Ilre no.28

Voskuil, Walter Henry 1892- Illinois Mineral Industry in 1947; Report of Investigations No. 140