Columbia subject headings:
Harvard subject headings:
Canada--Politics and government--1914-
Canada--Politics and government--1914-1945.
Canada--Politics and government--1945-1980.
Robertson, Norman A., 1904-1968.
Statesmen--Canada--Biography.
Princeton subject headings:
Canada--Politics and government--1914-
Robertson, Norman A., 1904-1968.
Statesmen--Canada--Biography.