Columbia subject headings:
Jews--Bulgaria--Plovdiv.
Poale Zion (Bulgaria)
Socialism and Judaism--Bulgaria--Plovdiv.
World Socialist Union of Jewish Workers--Po'alei Zion.
Zionism--Bulgaria--Plovdiv.
Harvard subject headings:
Jews--Bulgaria--Plovdiv.
Po'ale Zion (Bulgaria)
Zionism--Bulgaria--Plovdiv.
Princeton subject headings:
Jews--Bulgaria--Plovdiv.
Plovdiv (Bulgaria)--Ethnic relations.
Socialism and Judaism--Bulgaria--Plovdiv.
World Socialist Union of Jewish Workers--Po'alei Zion.
Zionism--Bulgaria--Plovdiv.