These are the 1:24,000 scale USGS Digital Raster Graphics. Each zipped file contains a TIFF image
 that is the scanned map along with a "world file" which contains the projection information for 
each of the files. Files are in a UTM projection with the Zone dependent on where each particular 
quad is located. All files west of Longitude -102 00 00 are Zone 13 with east of -102 00 00 are in 
Zone 14. Within the DOCUMENT directory are the documents that are located on the orginal Compact 
Disk that the DRGs were shipped on. Caution, if you are using a dial-up connection to the internet 
to down load these files, be prepared to wait. Some of these files could take over an hour to down-
load depending on you connection speed.