Columbia subject headings:
Washington (D.C.)--Guidebooks.
Washington (D.C.)--Pictorial works.
Harvard subject headings:
Washington (D.C.)--Description and travel--Pictorial works.
Washington (D.C.)--Guidebooks
Washington (D.C.)--Pictorial works
Princeton subject headings:
Guidebooks.
Washington (D.C.)--Guidebooks.
Washington (D.C.)--Pictorial works.