Columbia subject headings:
Harvard subject headings:
Guanajuato (Mexico)--Pictorial works.
Horgan, John, Jr.
La Luz Mining and Tunnel Co.--Pictorial works.
Mexico--Pictorial works.
Miners--Mexico--Pictorial works.
Mines and mineral resources--Mexico--Pictorial works.
Working class--Mexico--Pictorial works.
Princeton subject headings:
Guanajuato (Mexico)--Pictorial works.
Horgan, John, Jr., 1859-
Mexico--Pictorial works.
Miners--Mexico--Pictorial works.
Mines and mineral resources--Mexico--Pictorial works.
Working class--Mexico--Pictorial works.