Columbia subject headings:
Netherlands--Politics and government--1898-1948.
Statesmen--Netherlands--Biography.
Troelstra, Pieter Jelles, 1860-1930.
Harvard subject headings:
Netherlands--Politics and government--1898-1948.
Statesmen--Netherlands--Biography.
Troelstra, Pieter Jelles, 1860-1930
Princeton subject headings:
Netheralnds--Politics and government--1898-1948.
Statesmen--Netherlands--Biography.
Troelstra, Pieter Jelles, 1860-1930.