00497cam a2200181 a 4500001000700000003000800007005001700015008004100032035001100073040002100084082001500105100002000120245007700140260002800217300002200245650002600267650002200293779756BD-DhUL20160511152512.0870401s1971    fr            000 0 eng    a779756  cBD-DhULdBD-DhUL  a330.9bLEA1 aLengyel, Peter.10aApproaches to the science of socio economic development /cPeter Lengyel  aParis :bUnesco,c1971.  a383 p. :btables. 0aEconomic development. 0aSocial evolution.