11. Aeromagnetic map of part of the North Cascades National Park, Washington [cartographic material]
1984. 2023-09-08T15:24:47Z. 2023-09-09T03:02:36Z. Geological Survey (U.S.), author. U.S. Geological Survey. English. cartographic image. Public. Washington (State), North Cascades National Park, North Cascades National Park., and North Cascades National Park (Wash.).