Columbia subject headings:
Agricultural colonies--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Big Sioux River Valley (S.D. and Iowa)--History.
British--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Close Colony (Iowa)--History.
Cowan, James.
Cowan, Walter.
Harvard subject headings:
Agricultural colonies--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Big Sioux River Valley (S.D. and Iowa)--History.
British--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Close Colony (Iowa)--History.
Cowan, James.
Cowan, Walter.
Princeton subject headings:
Agricultural colonies--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Big Sioux River Valley (S.D. and Iowa)--History.
British--Big Sioux River Valley (S.D. and Iowa)--History--19th century.
Close Colony (Iowa)--History.
Cowan, James, 1862 or 1863-1940.
Cowan, Walter.