Category:Illinois State Geological Survey
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Subcategories
This category has the following 4 subcategories, out of 4 total.
Media in category "Illinois State Geological Survey"
The following 3 files are in this category, out of 3 total.
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Oil investigations in 1917 and 1918 (IA oilinvestigation40illi).pdf 975 × 1,470, 176 pages; 13.32 MB
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Qualities of high-grade paving brick and tests used in determining them, (IA qualitiesofhighg00talb).pdf 1,035 × 1,710, 94 pages; 5.7 MB
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Wisconsin Arch and Michigan Basin.jpg 1,925 × 2,150; 1.19 MB