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  • All fields: geyser
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    • Geyser runoff

    • Geothermal areas; Water pollution;
    • Different colored algae and dead tree stump in geyser runoff water in Yellowstone National Park.
    • A talk with John Grabowska, NPS filmmaker

    • Environmental education; Environments (Natural); Historic sites; History; Parks; Wildlife viewing; Podcast; Public Lecture;
    • John discusses Yellowstone National Park and the making of his film "Land to Life".
    • David Lenhart oral history transcript

    • Biography; Employees (USFWS); History; Pesticides; Biologists (USFWS); Birds; Fishes; Waterfowl;
    • David Lenhart oral history interview as conducted by Jerry C. Grover. Mr. Lenhart worked at the following locations during his tenure with the Fish and Wildlife Service: Matanuska Valley, Alaska, 1955, GS-5; 1956 GS-5 Umatilla, Oregon; Portland...

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