Columbia subject headings:
Costa Rica--Pictorial works.
Costa Rica--Social conditions--20th century--Pictorial works.
Photojournalism--Costa Rica.
Roa Velásquez, Mario, 1917-2004.
Harvard subject headings:
Costa Rica--History.
Costa Rica--Social conditions--20th century.
Photographers--Costa Rica.
Roa Velásquez, Mario--Photograph collections.
Princeton subject headings:
Costa Rica--Pictorial works.
Costa Rica--Social conditions--20th century--Pictorial works.
Photojournalism--Costa Rica.
Roa Velásquez, Mario, 1917-2004.