Columbia subject headings:
Chihuahua Trail--History.
Roads--Mexico--History.
Roads--New Mexico--History.
Roads--Texas--History.
Harvard subject headings:
Camino Real Project (Santa Fe, N.M.)
El Camino Real de Tierra Adentro National Historic Trail (N.M. and Tex.)--History.
Mexico--Civilization.
New Mexico--Civilization.
Texas--Civilization.
Trails--Mexico--History.
Trails--New Mexico--History.
Trails--Texas--History.
Princeton subject headings:
Chihuahua Trail--History.
New Mexico--History.
Roads--Mexico--History.
Roads--New Mexico--History.
Roads--Texas--History.