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The organization that has made the Item available believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries. Please refer to the organization that has made the Item available for more information.
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Issues regarding the new NPS methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park : oversight hearing
United States Congress, House Committee on Resources, Subcommittee on National Parks and Public Lands, Issues regarding the new NPS methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park : oversight hearing. Arizona Memory Project, accessed 20/05/2025, https://azmemory.azlibrary.gov/nodes/view/201026