TY - BOOK AU - Wallen,Robert N. TI - Introduction to physical geography SN - 0697151514 U1 - 910.02 PY - 1992/// CY - Dubuque, IA PB - Wm.C. Brown Publishers KW - Physical geography KW - Atmosphere; Biosphere; Lithosphere; Hydrosphere; Earth's system N2 - Environment Management ER -