Koyukuk vegetation types

Yukon Flats National Wildlife Refuge (YKF NWR) and Koyukuk NWR (KUK NWR), U.S. Fish and Wildlife Service (USFWS), initiated a project with the U.S. Geological Survey...隶属于美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service, USFWS）的育空平原国家野生动物保护区（Yukon Flats National Wildlife Refuge, YKF NWR）与科尤库克国家野生动物保护区（Koyukuk NWR, KUK NWR），联合美国地质调查局启动了一项项目……