Columbia subject headings:
Harvard subject headings:
Colorado--Biography.
Estes Park Region (Colo.)--Social life and customs.
Longs Peak (Colo.)
Mills, Joe, 1880-1935--Childhood and youth.
Natural history--Colorado
Pioneers--Colorado--Biography
Rocky Mountain National Park (Colo.)--History.
Princeton subject headings:
Colorado--Biography.
Estes Park Region (Colo.)--Social life and customs.
Longs Peak (Colo.)
Mills, Joe, 1880-1935--Childhood and youth.
Natural history--Colorado.
Pioneers--Colorado--Biography.
Rocky Mountain National Park (Colo.)--History.