Columbia subject headings:
Harvard subject headings:
Antofagasta (Chile)--Economic conditions--20th century.
Massacres--Chile--Antofagasta.
Saltpeter industry--Chile--Antofagasta--History--20th century.
Princeton subject headings:
Antofagasta (Chile)--History--20th century.
Massacres--Chile--Antofagasta--History--20th century.