Columbia subject headings:
Cryptography--Russia--History.
Russian literature--To 1700--History and criticism.
Slovo o polku Igoreve--Translations into Ukrainian.
Slovo o polku Igoreve.
Harvard subject headings:
Cryptography--Russia--History.
Russian literature--To 1700--History and criticism
Slovo o polku Igoreve--Translations into Ukrainian.
Princeton subject headings:
Cryptography--Russia--History.
Russian literature--To 1700--History and criticism.
Slovo o polku Igoreve--Translations into Ukrainian.