00389nam a22001337a 450000500170000002000180001708200170003510000280005224500550008026000450013530000090018065000330018965000330022220260321133728.0  a9789390680740  223a551bNOR  aNorton, William Harmon   aThe Elements of Geology  /cWilliam Harmon Norton   aJaipur :bHilltop Publications ,c2024 .  a293p  aExternal Geological Agencies  aInternal Geological Agencies