Barrett, O.
State Geological Survey. Bulletin ; no. 38 - Illinois-US : Illinois Mioning Investigations, 1922. - páginas 28-112 - Irregular - No. 38 (1922) - State Geological Survey. Bulletin ; no. 38 . - Department of Registration and Education. .
State Geological Survey. Bulletin ; no. 38 - Illinois-US : Illinois Mioning Investigations, 1922. - páginas 28-112 - Irregular - No. 38 (1922) - State Geological Survey. Bulletin ; no. 38 . - Department of Registration and Education. .
