Columbia subject headings:
Authors, Bulgarian--20th century--Political activity.
Bulgarian poetry--20th century--History and criticism.
Bŭlgarski zemedelski naroden sŭi︠u︡z--Biography.
Politics and literature--Bulgaria.
Harvard subject headings:
Authors, Bulgarian--20th century--Political activity.
Bulgarian poetry--20th century--History and criticism.
Bŭlgarski zemedelski naroden sŭi︠u︡z--Biography.
Politics and literature--Bulgaria.
Princeton subject headings: