The magnificent gateway : a layman's guide to the geology of the Columbia River Gorge /

por Allen, John Eliot, 1908-1996
Forest Grove, Or. : Timber Press, 1979

A roadside guide to the geology of the Great Smoky Mountains National Park /

por Moore, Harry L., 1949 March 28-
Knoxville : University of Tennessee Press, 1988
1st ed.

Geology of selected areas in New Jersey and eastern Pennsylvania and guidebook of excursions /

New Brunswick, N.J. : Rutgers University Press, 1969

Colossal cataract : the geologic history of Niagara Falls /

Albany : State University of New York Press, 1981

Roadside geology of Oregon /

por Alt, David D., Hyndman, Donald W.
Missoula, Mont. : Mountain Press Pub. Co., 1978

Roadside geology of Pennsylvania /

por VanDiver, Bradford B.
Missoula, Mont. : Mountain Press Pub. Co., 1990