This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
USGS Chicago Fig . en Map of the lake front at Chicago showing the position of the shoreline in and at intervals from to Geologic Atlas of the United States Chicago Folio This file cropped from scan of the folio on the website of the Texas University Libraries tamu edu United States Geological Survey PDUSGov Uploaded with