Columbia subject headings:
Gerstmann, Robert--Exhibitions.
Mineral industries--Bolivia--History--20th century--Pictorial works.
Photography, Industrial--Bolivia--Exhibitions.
Harvard subject headings:
Gerstmann, Robert--Exhibitions.
Photography, Industrial--Bolivia--20th century.
Princeton subject headings:
Gerstmann, Robert, 1896-1964--Exhibitions.
Mineral industries--Bolivia--History--20th century--Pictorial works.
Photography, Industrial--Bolivia--Exhibitions.