Columbia subject headings:
Ruthenians--History--16th century--Sources.
Ruthenians--History--17th century--Sources.
Ruthenians--Poland--History--16th century.
Ruthenians--Poland--History--17th century.
Ukraïnsʹka avtokefalʹna pravoslavna t︠s︡erkva--Poland.
Harvard subject headings:
Orthodox Eastern Church, Ukrainian--Poland.
Ruthenians--History--16th century--Sources.
Ruthenians--History--17th century--Sources.
Ruthenians--Poland--History--16th century.
Ruthenians--Poland--History--17th century.
Princeton subject headings: