Columbia subject headings:
Books and reading--Bulgaria--History.
Books--Bulgaria--History.
Harvard subject headings:
Book industries and trade--Bulgaria--History.
Books--Bulgaria--History.
Bulgaria--Intellectual life.
Bulgarian literature--1762-1900--Social aspects.
Bulgarian literature--20th century--Social aspects.
Literature and society--Bulgaria.
Princeton subject headings:
Book industries and trade--Bulgaria--History.
Books--Bulgaria--History.
Bulgaria--Intellectual life.
Bulgarian literature--1762-1900--Social aspects.
Bulgarian literature--20th century--Social aspects.
Literature and society--Bulgaria.