Gumbotil as a potential source of rotary drilling mud, bonding clay and bleaching clay
Subtitle: a progress report on the study of Illinois surficial clays
Series: Illinois State Geological Survey. Circular -- no. 39; Circular (Illinois State Geological Survey) -- no. 39.
Published: 1938
Place of publication: Urbana
Language: eng
Number of pages: 23
Subjects: Gumbotil