Columbia subject headings:
Aitzema, Foppe van, approximately 1580-1637.
Denmark--Foreign relations--Netherlands.
Hanseatic League.
Netherlands--Foreign relations--Denmark.
Thirty Years' War, 1618-1648.
Harvard subject headings:
Aitzema, Foppe van, approximately 1580-1637.
Denmark--Foreign relations--Netherlands.
Hanseatic League
Netherlands--Foreign relations--Denmark.
Thirty Years' War, 1618-1648
Princeton subject headings:
Aitzema, Foppe van, ca. 1580-1637.
Netherlands--Foreign relations--1556-1648.