00607nam a22001817a 450000500170000001000150001702000260003203500140005803700130007208200080008510000190009324501290011226000410024127000840028230000250036650000190039170000150041020191016163700.0  aENG-126677  a9789353160227c485.00  aEN-110209  bDBAD/PUB  a000  aGurbinder Kaur  aESENCIA science and technology :cby Gurbinder Kaur [and] H S Sidhubfor civil services and other competitive examinations /  aChennaibMcGraw Hill Educationc2019  a444/1, Sri Ekambara Naicker Industrial EstatebAlapakkam, Porur, Chenaie600116  axvi;520p.c27cm(pbk)  aIncludes index  aSidhu, H S