“We have an unknown distance yet to run, an unknown river to explore. What falls there are, we know not; what rocks beset the channel, we know not; what walls ride over the river, we know not. Ah, well! we may conjecture many things.”
(John Wesley Powell, 1834-1902)

Geographic Information Systems Links



3 km Buffer Example.jpg GypsumMineDEM.jpg ClackGeomap.jpg