Columbia subject headings:
Gay couples--Portraits--Catalogs.
Love in art--Catalogs.
Nini, Hugh--Photograph collections--Catalogs.
Portrait photography--Catalogs.
Treadwell, Neal--Photograph collections--Catalogs.
Harvard subject headings:
Gay couples--History--19th century--Pictorial works.
Gay couples--History--20th century--Pictorial works.
Gay men--History--19th century--Pictorial works.
Gay men--History--20th century--Pictorial works.
Nini, Hugh--Photograph collections.
Photobooks
Portrait photography
Treadwell, Neal--Photograph collections.
Princeton subject headings: