3 Illinois State Geological Survey Bulletins 1925 1928 1934 Prairie Limestone

1 hardcover and 2 softcover - names inside of books - all show some wear and pages are yellowing from age
1928 - Green hardcover - Bulletin NO 53 - Geology and Economic Resources of the St Peter Sandstone of Illinois
1925 - Gray softcover - Bulletin NO 46 - Limestone Resources of Illinois
1934 - Blue softcover - Bulletin NO 42 - The Prairie Province of Illinois