Columbia subject headings:
Jews--Poland--Warsaw--History--20th century.
Labor Zionism--Poland--Warsaw--History.
Shomer-ha-tsaʻir be-Ṿarshah (Organization)--History.
Harvard subject headings:
Shomer-ha-tsaʻir be-Ṿarshah (Organization)
Princeton subject headings:
Shomer-ha-tsaʻir be-Ṿarshah (Organization)--History.