Columbia subject headings:
Mexico--Bibliography.
Mexico.
Silver mines and mining--Southwest, New.
Southwest, New--Bibliography.
Southwest, New.
Harvard subject headings:
Mexico
Mexico--Bibliography.
Silver mines and mining--Southwest, New.
Southwest, New--Bibliography.
Southwest, New.
Princeton subject headings:
Mexico--Bibliography.
Mexico.
Silver mines and mining--Southwest, New.
Southwest, New--Bibliography.
Southwest, New.