112348546,Database Systems 115987938,Database Systems 348121549,Database Systems 322654189,Database Systems 552455318,Database Systems 455798411,Operating System Design 552455318,Operating System Design 567354612,Operating System Design 112348546,Operating System Design 115987938,Operating System Design 322654189,Operating System Design 567354612,Data Structures 552455318,Communication Networks 455798411,Optical Electronics 301221823,Perception 301221823,Social Cognition 301221823,American Political Parties 556784565,Air Quality Engineering 099354543,Patent Law 574489456,Urban Economics