Columbia subject headings:
Harvard subject headings:
Hopf family.
Klingenthal (Germany : Landkreis)--Biography.
Klingenthal (Germany : Landkreis)--Genealogy.
Stringed instrument makers--Germany--Klingenthal (Landkreis)--Biography.
Stringed instrument makers--Germany--Klingenthal (Landkreis)--Genealogy.
Princeton subject headings:
Hopf family.
Klingenthal (Germany)--Biography.
Violin makers--Germany--Klingenthal--Biography.