Columbia subject headings:
Books--Slavic countries--History.
Incunabula--Bibliography--Union lists.
Incunabula.
Printing--Slavic countries--History.
Harvard subject headings:
Books--Slavic countries--History.
Incunabula--Bibliography--Union lists.
Incunabula.
Printing--Slavic countries--History.
Princeton subject headings:
Books--Slavic countries--History.
Incunabula--Bibliography--Union lists.
Incunabula.
Printing--Slavic countries--History.
Union catalogs.