Columbia subject headings:
Heldring, Louis, 1852-1923.
Middle East--Pictorial works.
Photography--Middle East--19th century.
Harvard subject headings:
Heldring, Louis, 1852-1923.
Middle East--Pictorial works.
Photography--Middle East--History--19th century.
Princeton subject headings:
Heldring, Louis, 1852-1923.
Middle East--19th century--Pictorial works.
Photography--Middle East--19th century.