U.S. Geological Survey Open-File Report 92–0437
Originally published in 1992, this report is presented here in Portable Document Format.
Adobe Reader 9.0 is required to view it.
If you wish to download a free copy of the latest version of Adobe Reader, click here.
If you already have Acrobat Reader 9.0 or later installed on your computer, click here to view the text (4.5 MB).
For more information about this report, contact William D. Heran at email@example.com