Map of Oregon, Washington and part of Idaho 
In order to view the images, a DJVU plugin from Lizard Technologies is required. This free software allows you to display high-resolution (high-quality) images on a web site and provides useful tools, such as the ability to zoom in and out, pan, adjust color, etc.
When you select a page to display, the software is automatically installed if you are using Internet Explorer on a PC. Choose "Yes" when prompted to confirm the installation. If are using a Mac or a browser other than Internet Explorer, you will be directed to a page with downloading instructions.