Front Matter -- Acknowledgment of Review Participants -- Preface -- Contents -- Summary -- 1 Introduction -- 2 Historical Perspective: Yellowstone's Changing Environment -- 3 Present Conditions: Vegetation -- 4 Present Conditions: Animals -- 5 Conclusions and Recommendations -- References -- Appendix A Understanding the Past -- Appendix B Biographical Information on The Committee on Ungulate Management in Yellowstone National Park.