Columbia subject headings:
Architecture--Rhine River Valley--History--20th century--Designs and plans.
Architecture--Rhine River Valley--History--21st century--Designs and plans.
Harvard subject headings:
Architecture, Modern--20th century--Designs and plans
Architecture, Modern--21st century--Designs and plans.
Architecture--Germany--21st century.
Architecture--Rhine River Valley--20th century--Designs and plans.
Architecture--Rhine River Valley--21st century--Designs and plans.
Architecture--Switzerland--21st century.
Rhine River Valley--Buildings, sturctures, etc.
Princeton subject headings: