This map was printed on an electronic plotter directly from digital files. 
Dimensional calibration may vary between electronic plotters and between 
X and Y directions on the same plotter, and paper may change size due to 
atmospheric conditions; therefore, scale and proportions may not be true 
on plots of this map. Color also varies between plotters and may need to
be adjusted.  

Digital files are available on World Wide Web at 
http://geopubs.wr.usgs.gov/i-map/i2267

The digital database is not meant to be used or displayed at any scale 
larger than 1:250,000 (e.g., 1:100,000 or 1:24,000). 
