Columbia subject headings:
Houseboats--France--History--21st century--Congresses.
Houseboats--France--History--21st century--Pictorial works.
Sustainable architecture--France--History--21st century--Congresses.
Sustainable architecture--France--History--21st century--Pictorial works.
Harvard subject headings:
Princeton subject headings:
Houseboats--France--History--21st century--Congresses.
Houseboats--France--History--21st century--Pictorial works.
Sustainable architecture--France--History--21st century--Congresses.
Sustainable architecture--France--History--21st century--Pictorial works.