00361nam a2200145 a 450000500170000002000150001708200130003210000180004524500520006325000120011526000310012730000250015850000110018370000210019420251203110205.0  a0471161187  a551bSKI  aSkinner, B.J.  aDynamic earthbIntroduction to physical geology  a4th ed.  aNew YorkbJohn wileyc1999  axxii,608p.c22cm. PB  ainc.CD  aPorter,Stephen C