Columbia subject headings:
Harvard subject headings:
Mineral industries--Social aspects--Austria--Tyrol--History--Congresses.
Mineral industries--Social aspects--Germany--History--Congresses.
Miners--Austria--Tyrol--Social life and customs--Congresses.
Miners--Germany--Social life and customs--Congresses.
Mining engineers--Austria--Tyrol--Biography--Congresses.
Mining engineers--Germany--Biography--Congresses.
Princeton subject headings:
Mineral industries--Social aspects--Austria--Tyrol--History--Congresses.
Mineral industries--Social aspects--Germany--History--Congresses.
Miners--Austria--Tyrol--Social life and customs--Congresses.
Miners--Germany--Social life and customs--Congresses.
Mining engineers--Austria--Tyrol--Biography--Congresses.
Mining engineers--Germany--Biography--Congresses.