Columbia subject headings:
Harvard subject headings:
Environmental policy--Sangre de Cristo Mountains (Colo. and N.M.)
Nature--Effect of human beings on--Sangre de Cristo Mountains (Colo. and N.M.)
Sangre de Cristo Mountains (Colo. and N.M.)--History.
Princeton subject headings:
Environmental policy--Sangre de Cristo Mountains (Colo. and N.M.).
Nature--Effect of human beings on--Sangre de Cristo Mountains (Colo. and N.M.).
Sangre de Cristo Mountains (Colo. and N.M.)--History.