Columbia subject headings:
Spain--Colonies--Administration--Early works to 1800.
Spain--Commerce--Early works to 1800.
Spain--Commercial policy--Early works to 1800.
Spain--Population--Early works to 1800.
Taxation--Spain--Early works to 1800.
Harvard subject headings:
Spain--Colonies--Administration--Early works to 1800.
Spain--Colonies--Administration.
Spain--Commerce--Early works to 1800.
Spain--Commerce.
Spain--Commercial policy--Early works to 1800.
Spain--Commercial policy.
Spain--Population
Spain--Population--Early works to 1800.
Taxation--Spain
Taxation--Spain--Early works to 1800.
Princeton subject headings:
Spain--Colonies--Administration--Early works to 1800.
Spain--Commerce--Early works to 1800.
Spain--Commercial policy--Early works to 1800.
Spain--Population--Early works to 1800.
Taxation--Spain--Early works to 1800.