Columbia subject headings:
Land use, Rural--Southwestern States.
Rangelands--Southwestern States.
Soil conservation--Southwestern States.
Harvard subject headings:
Land use, Rural--Southwestern States.
Rangelands--Southwestern States.
Soil conservation--Southwestern States.
Princeton subject headings:
Land use, Rural--Southwestern States.
Rangelands--Southwestern States.
Soil conservation--Southwestern States.