Columbia subject headings:
Harvard subject headings:
Bydgoszcz (Poland)--Social life and customs.
Middle class--Poland--Bydgoszcz--History.
Princeton subject headings:
Bydgoszcz (Poland)--Social conditions--16th century.
Bydgoszcz (Poland)--Social conditions--17th century.
Middle class--Poland--Bydgoszcz--History.