Index Maps. Index maps for the 1:100,000 and 1:250,000 scales are available on-line for viewing using Netscape or Internet Explorer. Indexes for the 1:24,000 series are available by mail for $3, or they are available on-line for downloading to your PC. Please note that the index map files are very large and are downloaded in compressed format. You will need PKUNZIP, or some other compression program to decompress the files. The files are in .tif format, and you will need an appropriate viewer, such as PhotoShop, to view the indexes; Netscape cannot handle the large file sizes.
Click here for USGS 1:24,000 index mapsOmni Resources or the