00582cam a2200217 a 4500 779756 BD-DhUL 20160511152512.0 870401s1971 fr 000 0 eng 779756 BD-DhUL BD-DhUL 330.9 LEA Lengyel, Peter. Approaches to the science of socio economic development / Peter Lengyel Paris : Unesco, 1971. 383 p. : tables. Economic development. Social evolution. ddc BK ANL 339.5 L566 63376 63376 0 0 ddc 0 330_900000000000000_LEA 0 NFIC 107550 DUL DUL GEN 2016-05-11 perchesed 330.9 LEA A195333 2016-05-11 2016-05-11 BK