Columbia subject headings:
Harvard subject headings:
Chile saltpeter industry--Chile--Tarapacá (Province)--History.
Chile saltpeter industry--Social aspects--Chile--Tarapacá (Region)
Chile saltpeter--Chile--Tarapacá (Province)--History.
Tarapacá (Chile : Province)--History.
Tarapacá (Chile : Region)--Economic conditions.
Tarapacá (Chile : Region)--Social conditions.
Princeton subject headings:
Chile saltpeter industry--Chile--Tarapacá (Province).
Tarapacá (Chile : Province)--Economic conditions.
Tarapacá (Chile : Province)--Social conditions.