[020-41] The Phosphate Rock Industry of Morocco
The Phosphate Rock Industry of Morocco Author: Hohma, Fred S.
[020-39] Oil Prospecting in the Western Illinois on the Basis of the Structure of Coal Beds
Oil Prospecting in the Western Illinois on the Basis of the Structure of Coal Beds Author: Bell, Alfred H.
[020-38] Molluscan Life in the Loess Deposits of Illinois*
Molluscan Life in the Loess Deposits of Illinois* Author: Baker, Frank Collins
[020-37] Pre-Penns3lvanian Surface West of the Duquoin Anticline*
Pre-Pennsylvanian Surface West of the Duquoin Anticline* Author: Hanbest, L.G.
[020-36] Karst Topography and Sanitiary Engineering at Alton, IL
Karst Topography and Sanitiary Engineering at Alton, IL Author: Lamar, J.E.