Elemental Geosystems - 8th Edition Author:Robert W. Christopherson, Ginger Birkeland NOTE: You are purchasing a standalone product; MasteringGeography does not come packaged with this content. If you would — like to purchase both the physical text and MasteringGeography search for 0321984447 / 9780321984449 Elemental Geosystems Plus MasteringGeography with eText -- Access Card Package, 8/e--This package contains: 032198501X / ... more »9780321985019 Elemental Geosystems 0321987330 / 9780321987334 MasteringGeography with Pearson eText -- ValuePack Access Card -- for Elemental Geosystems