["HISTORY \/ United States \/ General","Natural history;Rocky Mountains Region.","Rocky Mountains Region;History.","Rocky Mountains Region;Social life and customs.","GENERAL","GEOGRAPHY OF THE UNITED STATES","General Adult","HISTORICAL GEOGRAPHY","HISTORY \/ United States \/ General","History","History\/American","Natural history;Rocky Mountains Region.","Non-Fiction","Rocky Mountains Region;History.","Rocky Mountains Region;Social life and customs.","United States"]