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acreage acres agricultural amount animals average birds bushels Canal census cent Champaign Chicago River cities coal Cook County Copyright by Keystone corn county seat crops district East St experiment fields extending Family farm feet flood plain forest glacial Illinois country Illinois Ozarks Illinois River Illinois State Normal Illinois Valley Illinoisan important inches increased Indian industry Joliet Kankakee Kaskaskia Kaskaskia River Keystone View Company Lake County Lake Michigan land Lincoln located Louis manufacturing mineral mines Mississippi River moraine Normal School northern oats Ogle County Ohio River Ozark Park Peoria plants population prairie production railroad rainfall region ridges River Basin Robert Ridgway Rock Island Rock River settlement silt loam soil southern Illinois species Springfield square miles Starved Rock stations steamboat streams temperature timber tion tons transportation trees United University of Illinois Urbana Wabash River wheat Wisconsin
JSTOR: The Geography of Illinois