Category:Old geological maps of Illinois
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Media in category "Old geological maps of Illinois"
The following 6 files are in this category, out of 6 total.
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381 of 'Geological Survey of Illinois. A. H. Worthen, Director' (11074244434).jpg 3,407 × 2,773; 1.69 MB
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Physical features of the Des Plaines Valley (1909) (14595635419).jpg 1,766 × 2,360; 392 KB
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Physical features of the Des Plaines Valley (1909) (14802175293).jpg 1,562 × 2,082; 399 KB