Columbia subject headings:
Berninger, Herman--Art collections--Exhibitions.
Herzog, Peter, 1948---Photograph collections--Exhibitions.
Herzog, Ruth--Photograph collections--Exhibitions.
Pougny, Jean, 1892-1956--Exhibitions.
Soviet Union--History--Revolution, 1917-1921--Photograph collections--Exhibitions.
Harvard subject headings:
Princeton subject headings:
Berninger, Herman--Art collections--Exhibitions.
Herzog, Peter--Photograph collections--Exhibitions.
Herzog, Ruth--Photograph collections--Exhibitions.
Pougny, Jean, 1892-1956--Exhibitions.