Columbia subject headings:
Booksellers and bookselling--Poland.
Corn family.
Publishers and publishing--Poland.
Harvard subject headings:
Book industries and trade--Poland--Wrocław--History.
Corn family.
Korn (Firm)
Publishers and publishing--Poland--Wrocław--History.
Wrocław (Poland)--History.
Princeton subject headings:
Booksellers and bookselling--Poland.
Corn family.
Publishers and publishing--Poland.