Columbia subject headings:
Geology--New Mexico--Grant County--Maps.
Geomagnetism--New Mexico--Grant County--Maps.
Maps.
Harvard subject headings:
Geology--New Mexico--Maps.
Geomagnetism--New Mexico--Maps.
New Mexico--Maps.
Princeton subject headings:
Geology.
Geomagnetism.
Geophysics.
Maps.
Silver City Mining Region (N.M.)--Maps.