Columbia subject headings:
Harvard subject headings:
Foreign workers, Polish--Canada--Social conditions.
Foreign workers, Polish--Germany--Social conditions.
Polish people--Canada--Biography.
Polish people--Canada--Social conditions.
Polish people--Germany--Biography.
Polish people--Germany--Social conditions.
Princeton subject headings:
Foreign workers, Polish--Canada--Social conditions.
Foreign workers, Polish--Germany--Social conditions.
Polish people--Canada--Social conditions.
Polish people--Gerrmany--Social conditions.