00465nam a2200169 a 450000500170000002000180001708200180003510000250005324500620007826000330014030000430017360000080021663000270022463000320025185600060028385600060028920251203114844.0  a9789352405705  a351.0765bAGR  aAgrahari, Ravi P.d_  aScience and technology for civil services examinationsb_  aNew DelhibMcGraw Hillc2017  a850 p. in various pagings.c24 cm.bPB  bc_  aScience and technology  aCivil services examinations  f_  a_