Current developments in rock, rock products, and industrial minerals
Series: Illinois State Geological Survey. Circular -- no. 23-D; Circular (Illinois State Geological Survey) -- no. 23-D.; Circular (Illinois State Geolocial Survey) -- no. 23-D.
Published: 1938
Place of publication: Urbana
Language: eng
Number of pages: 66
Subjects: Stone; Congresses; Mineral industries
Notes: "Extract of the Contributions of the fifth annual Illinois Mineral Industries Conference."