Columbia subject headings:
Harvard subject headings:
Calvör, Henning, 1686-1766--Exhibitions.
Mining engineering--Germany--Clausthal-Zellerfeld--Exhibitions.
Mining engineers--Germany--Clausthal-Zellerfeld--Biography.
Princeton subject headings:
Calvör, Henning, 1686-1766--Exhibitions.
Mining engineering--Germany--Clausthal-Zellerfeld--Exhibitions.
Mining engineers--Germany--Clausthal-Zellerfeld--Biography.