00313nam a2200121 a 450000500170000002000150001708200160003210000230004824500340007125000120010526000450011730000290016220251203110115.0  a8173192693  a512.02bGAL  aGallian, Joseph A.  aContemporary abstract algebra  a4th ed.  aNew DelhibNarosa Publishing Housec1999  axii, 583eA55 p.c23 cm.