I know longer use these, won't fit my Garmin..LOL. These do not have contour information. They show creeks, rivers, and roadbeds in the form of trails and bridges, culverts, cemeteries and things of that nature in the form of waypoints. They overlay with your current map and are used in conjunction with your current map.
Sell or Trade, $30 each, both for $50. PM best. DFW area