Columbia subject headings:
Gardner, Alexander, 1821-1882--Exhibitions.
Indians of North America--Portraits--Exhibitions.
Portrait photography--Exhibitions.
United States--History--Civil War, 1861-1865--Pictorial works--Exhibitions.
Harvard subject headings:
Documentary photography--United States--Exhibitions.
Gardner, Alexander, 1821-1882--Exhibitions.
Garner, Alexander, 1821-1882--Photograph collections--Exhibitions.
Lincoln, Abraham, 1809-1865--Portraits--Exhibitions.
Photography--United States--History--19th century--Exhibitions.
Portrait photography--United States--Exhibitions.
United States--History--Civil War, 1861-1865--Photography--Exhibitions.
United States--History--Civil War, 1861-1865--Pictorial works--Exhibitions.
West (U.S.)--History--Pictorial works--Exhibitions.
Princeton subject headings:
Gardner, Alexander, 1821-1882--Photograph collections--Exhibitions.
Photography--United States--History--19th century--Exhibitions.
United States--History--Civil War, 1861-1865--Pictorial works--Exhibitions.
West (U.S.)--History--1860-1890--Pictorial works--Exhibitions.