Columbia subject headings:
Feudalism--Europe, Central--History.
Feudalism--Europe, Eastern--History.
Slavs--History.
Harvard subject headings:
Feudalism--Europe, Eastern.
Feudalism--Slavic countries.
Land tenure--Europe, Eastern--History.
Land tenure--Slavic countries--History.
Princeton subject headings:
Feudalism--Europe, Eastern.
Feudalism--Slavic countries.
Land tenure--Europe, Eastern--History.
Land tenure--Slavic countries--History.