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One-Hundred and Five-Hundred Year Floodzones for Unincorporated Areas [Illinois] Datasets datasets University Of Illinois Urbana Champaign university-of-illinois-urbana-champaign

1996. Illinois State Water Survey and Illinois State Geological Survey. Statewide polygon feature class of 100 and 500 year flood zones for unincorporated areas of Illinois as indicated on Federal Emergency Management A... Illinois State Geological Survey.