Columbia subject headings:
Spirit photography.
Harvard subject headings:
Ghosts--Pictorial works--Exhibitions.
Mediums--History--Exhibitions.
Mediums--Pictorial works--Exhibitions.
Occultism--History--Exhibitions.
Occultism--Pictorial works--Exhibitions.
Seances--History--Exhibitions.
Spirit photography--Exhibitions.
Princeton subject headings:
Spirit photography.