na INLIS000000000005375 0010-1021000209 Impacts of motorized boat size on small-scale fishermen income in Langkat, North Sumatera Achmad Suryana ... (et al.) Bogor Center for Agro Economic Research 1987 vii, 68 p. ill.; 30 cm. 639.2.057/CEN/i 639.2.057/CEN/i PENDAPATAN NELAYAN. 718