na INLIS000000000011982 20240306083403 0010-0521011982 240306 | | 0-582-02883-3 en 63/VAN/a 63/VAN/a VAN DEN BAN, A.W. Hawkins, H.S. Agricultural extension / VAN DEN BAN, A.W. Essex : Longman Scientific and Technical, 1988 xi, 328 p.: ill.; 22 cm. AGRICULTURE -- EXTENSION 400/ODA/1990