This report has been prepared by the Northern Cheyenne Tribe under contract with the Bureau of Land Management (BLM). The BLM is in the process of amending the Powder River and Billings Area Resource Management Plans to address large-scale development of coal-bed methane (CBM) resources in southeastern Montana, report is to characterize those aspects of the Reservation environment and resources, social, economic, cultural and physical, which have the potential to be affected by CBM and other energy development on adjacent lands. By identifying lands, resources and services which are likely to be vulnerable to impacts, the report is intended to assist BLM in meeting its trust obligations to prevent and/or mitigate the impacts of off-Reservation development on the Tribe and its Reservation--Page 1.