Columbia subject headings:
Harvard subject headings:
Floods--Pennsylvania--Johnstown--History--19th century.
Johnstown (Cambria County, Pa.)--Economic conditions.
Johnstown (Cambria County, Pa.)--History.
Johnstown (Cambria County, Pa.)--Pictorial works.
Princeton subject headings:
Floods--Pennsylvania--Johnstown--History--19th century.
Johnstown (Cambria County, Pa.)--Description--Views.
Johnstown (Cambria County, Pa.)--Economic conditions.
Johnstown (Cambria County, Pa.)--History.