00400cam a2200169 450000500170000024500610001702000050007810000210008304400160010425000090012004100080012930000180013750000050015583000050016026000480016508200170021320260711133832.0 aLos conceptos elementales del materialismo históricob a aHarnecker, Marta aEl Salvador a1ª aspa a341 p. 19 cm. a v a San SalvadorbEdiciones Chiltic Amatc1971 a146.3bH829c