Dinosaur national monument Feature on Mantle ranch - last working ranch in area, located in Hell's Canyon. Post Empire N 26, 1978 p.lfl-13 Colorado. Historical Society to sponsor river raft expedition thru the monument Aug. 18-22. RMN Jy 24,1982 p.75 Rafters vow to raft Green River through Monument despite laws. RMN Je 26, 1985 p.18 Environmentalists seek halt to pesticide spraying at Dinosaur National Monument. RMN Jy 11, 1985 p.18
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