National Parks and Monuments
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...347 (546) Volcanic rock tower; first national monument. Dinosaur MO Colo., Utah 1915 210,278 (85,133) Rich quarries...cliffs, plateaus, canyons, and desert grasslands; fossilized dinosaur footprints. Walnut Canyon MO N Ariz. 1915 3,579 (1,449...