Columbia subject headings:
Harvard subject headings:
Huygens, Lodewijck--Travel--Spain.
Netherlands--Foreign relations--Spain.
Spain--Description and travel--Early works to 1800.
Spain--Foreign relations--Netherlands.
Princeton subject headings:
Diaries.
Huygens, Lodewijck--Diaries.
Huygens, Lodewijck--Travel--Spain.
Netherlands--Foreign relations--Spain.
Spain--Description and travel--Early works to 1800.
Spain--Foreign relations--Netherlands.
Spain--History--Philip IV, 1621-1665.
Voyages and travels--Early works to 1800.