README INSTRUCTIONS FOR USING THE FILE IN THE FOLDER ofr-97-0081 U.S. Geological Survey Open File Report 97-81, entitled "An introduction to sand and gravel deposit models, Front Range Urban Corridor" The file in this folder is in Portable Document Format. To view or print it after downloading, you must use Adobe Acrobat ReaderTM (v. 3.0 or later), which is available free at . Files are viewable in earlier versions of Acrobat Reader but may not print properly. ÿ