Columbia subject headings:
Photography--Puerto Rico--History.
Puerto Rico--History--1898-1952--Pictorial works.
Puerto Rico--History--To 1898--Pictorial works.
Puerto Rico--Pictorial works.
Harvard subject headings:
Photography--Puerto Rico--History.
Puerto Rico--History--1898-1952--Pictorial works.
Puerto Rico--History--To 1898--Pictorial works.
Puerto Rico--Pictorial works.
Princeton subject headings:
Photography--Puerto Rico--History.
Puerto Rico--Description and travel--Views.
Puerto Rico--History--1898-1952--Pictorial works.
Puerto Rico--History--To 1898--Pictorial works.