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    NPS scientist shows some of the electronic components used to create noise traffic display signs.
    The Natural Sounds and Night Skies Division technical laboratory originates innovative instrumentation for use in national park units.
    Sound equipment is installed on a snowy hillside at Mesa Verde National Park
    As part of a 2015-2016 field research study at Mesa Verde National Park, NPS scientists installed recording equipment to measure sounds in three distinct locations across the park.
    A female hiker sits atop a mountain and contemplates the quiet of her surroundings.
    World Listening Day, World Listening Day, an annual event organized by the World Listening Project, invites people to tune to the world of sound around them through the practice of listening.
    Wind ripples patterns across sand dunes at Great Basin National Park.
    Each national park has a unique soundscape — a composition that includes the voices of animal occupants and geologic features.