Grand Canyon: Open the floodgates!
Powell
Kendall
K
D000818:Animals; D003120:Colorado; D003530:Cyprinidae / Q000502:physiology; D017753:Ecosystem; D005618:Fresh Water; D005843:Geography; D019015:Geologic Sediments / Q000032:analysis; D007198:Indians, North American; D011210:Power Plants; D014337:Trout / Q000502:physiology; D006801:Humans