This is a KML network link that can display map tiles from North American Maps as overlays in Google Earth.
To get started, have a look at the main page and the FAQ to see how it works. Then either
Currently (version 10), there are 6 overlays related to North American Maps:
|USGS The National Map Area Fills||USGS The National Map Structures||USGS The National Map Contours||USGS The National Map Hydrography|
Do you have comments, bug reports, or suggestions for other map sources? Please leave them below.