Columbia subject headings:
Documentary photography.
Hallmark Cards, Inc.--Photograph collections--Exhibitions.
Hallmark Photographic Collection--Exhibitions.
Lange, Dorothea--Exhibitions.
Photography, Artistic--Exhibitions.
Harvard subject headings:
Documentary photography--United States--Exhibitions.
Hallmark Photographic Collection--Exhibitions.
Lange, Dorothea--Exhibitions.
Princeton subject headings:
Lange, Dorothea--Exhibitions.
Photography, Artistic--Exhibitions.