Columbia subject headings:
España S., Pedro G. (Pedro Guillermo España Simbrón), 1908-
Mineral industries--Bolivia--History.
Mining engineers--Bolivia--Biography.
Harvard subject headings:
España S., Pedro G. (Pedro Guillermo España Simbrón), 1908-
Mineral industries--Bolivia--History.
Mining engineers--Bolivia--Biography.
Princeton subject headings:
España S., Pedro G. (Pedro Guillermo España Simbrón), 1908-
Mineral industries--Bolivia--History.
Mining engineers--Bolivia--Biography.