Columbia subject headings:
Poets, Greek (Modern)--20th century--Congresses.
Ritsos, Giannēs, 1909-1990--Congresses.
Harvard subject headings:
Poets, Greek (Modern)--20th century--Congresses.
Ritsos, Giannēs, 1909-1990--Congresses.
Ritsos, Giannēs, 1909-1990--Political activity.
Princeton subject headings:
Poets, Greek (Modern)--20th century--Congresses.
Ritsos, Giannēs, 1909-1990--Congresses.