00356nam a2200157 a 450000500170000000800410001703500190005810000220007722200100009924500200010930000080012936200160013790400150015390500130016899900170018120210219153050.0991125n                      000 0 spa u  aUPN01000075368  aPiastro, Estrella  aDIDAC  aEl profesor hoy  a3-5  a1998 No. 31  aACb013179  aArticulo  c67501d67501