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(a) Hilly terrain of the foothills portion (45%) of the 1002 Area of the Arctic National Wildlife Refuge. Snow regimes are highly variable, and hilly terrain would be difficult for seismic vehicles and camp trains to negotiate (photo: M. Nolan). (b) Flat coastal plain of the North Slope (Cape Halkett area, NPR‐A), where the majority of 3D‐seismic surveys on the North Slope have occurred (photo: M. T. Jorgenson).
