Materials included in digital Geological Survey of Illinois are not subject to U.S. copyright law. The Library encourages the use of these materials for educational and scholarly purposes, but any use requires that a credit line be included with each citation. The credit line for reproductions of images from the digital Geological Survey of Illinois should be, University of Chicago Library.
Use of these materials in commercial publication projects requires the permission of the University of Chicago Library and is subject to a use fee. For permission to copy or use of materials from digital Geological Survey of Illinois for any commercial purposes, please contact:
Special Collections Research Center
For infomation on ordering reproductions, please see the Ordering Reproductions web page.