DRG

A digital raster graphic (DRG) is a scanned and georectified image of a USGS standard series topographic map. This DRG of Wyoming is a digital map product available for free download from the website listed below. It is not a very clear picture but you can make out the topography and use it for doing work in a GIS. Because it is georectified, it contains spatial reference information that will communicate the spatial location of features on the map. The raster format records, stores and processes cartographic data in a cell or pixel. Of course, you have to be careful with the sources for DRGs and make sure you know how they are georeferenced.

If you click the map twice the image is a bit clearer.

Link to website:
http://wgiac.state.wy.us/scripts/DRGMAP/DRGmap.aspx?Area_Type=250K