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Books about Illinoian:
Illinoian and Wisconsinan Stratigraphy and Environments in Northern Illinois: the Altonian Revised by R. C. et al. Berg (1985)
Illinoian and Pre-Illinoian Stratigraphy of Southeast Iowa and Adjacent Illinois by G. R. Hallberg (1980)
Illinoian and Kansan Molluscan Faunas of Illinois Circular 461 by A. Byron; Frye, John C. and Johnson, W. Hilton Leonard (1971)
ILLINOIAN AND WISCONSIN DRIFT OF THE SOUTHERN PART OF THE GRAND RIVER LOBES IN EASTERN OHIO. by George W. White (1951)
Illinoian and Wisconsinan Molluscan Faunas in Kansas, 1952, Articles, 9 (Mollusca 4) : 1-38, 15 figures and 5... by A. B. Leonard (1952)
Illinoian and Sangamon Vegetation in Southwestern Kansas and Adjacent Oklahoma, 1965, Contributions from the Museum... by R. O. Kapp (1965)
Illinoian and Kansan molluscan faunas of Illinois by A. Byron Frye, John Chapman, ; Johnson, W. Hilton; Leonard (1971)
Wiki information Illinoian:
The Illinoian Stage is the name used by Quaternary geologists in North America to designate the period of geologic time of ~191,000—130,000 years ago, a period of ~0.061 million years during the middle Pleistocene when sediments comprising the...
The Pre-Illinoian Stage is used by Quaternary geologists for the early and middle Pleistocene glacial and interglacial periods of geologic time in North America from ~2.5–0.5 Ma, a period of ~2 million years.