TY - BOOK ED - UNESCO. TI - A Guide to the operation of the agreement for facilitating the international circulation of visual and auditory materials of an educational, scientific, and cultural character: Beirut agreement adopted by the General Conference of Unesco at Beirut, 1948 U1 - 341.24 PY - 1954/// CY - Paris PB - UNESCO KW - Audio-visual library service KW - Audio-visual materials KW - Circulation KW - International Librarianship ER -