Oklahoma has seen many changes in its first century as a state - in people. vision, industry, and purpose. In addition, the very appearance of the Sooner State has evolved over the decades. The changes, both persistent and profound, are displayed by "before and after" photographs in this book. The authors, perhaps the state's foremost authorities on biologic and environmental landscape change, present explanations of why specific locations in the state remain nearly the same or have taken on a completely different appearance.