TY - BOOK AU - Christopherson,Robert W. TI - Elemental geosystems SN - 0130168009 AV - GB54.5 .C46 2001 U1 - 910/.02 21 PY - 2001/// CY - Upper Saddle River, NJ PB - Prentice Hall KW - Physical geography N1 - Includes bibliographical references and index ER -