Columbia subject headings:
Governors--Minnesota--Biography.
Journalists--Minnesota--Biography.
Minnesota--Politics and government--1858-1950.
Petersen, Hjalmar, 1890-1968.
Harvard subject headings:
Governors--Minnesota--Biography.
Journalists--Minnesota--Biography.
Minnesota--Politics and government--1858-1950.
Petersen, Hjalmar, 1890-1968.
Princeton subject headings:
Governors--Minnesota--Biography.
Journalists--Minnesota--Biography.
Minnesota--Politics and government--1858-1950.
Petersen, Hjalmar, 1890-1968.