00334nam a2200133 a 450000500170000002000150001708200150003210000140004711000190006124500330008026000400011330000250015370000220017820251203111443.0  a8180696138  a555.4bEAR  aKumar, A.  aKushwaha, R.S.  aEarth system sciences: vol.1  aNew DelhibConcept Publishingc2008  axxv,291p.c22cm.bHB  aThakur, Baleshwar