Columbia subject headings:
Garden tours--Belgium--Guidebooks.
Garden tours--Netherlands--Guidebooks.
Gardens--Belgium--Guidebooks.
Gardens--Netherlands--Guidebooks.
Harvard subject headings:
Garden tours--Belgium--Guidebooks.
Garden tours--Netherlands--Guidebooks.
Gardens--Belgium--Guidebooks.
Gardens--Netherlands--Guidebooks.
Princeton subject headings:
Garden tours--Belgium--Guidebooks.
Garden tours--Netherlands--Guidebooks.
Gardens--Belgium--Guidebooks.
Gardens--Netherlands--Guidebooks.