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  • All fields: tranquilizer
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    • David L. Spencer oral history transcript

    • History; Biography; Personnel; Wildlife refuges; Aviation;
    • David L. Spencer oral history interview with Jim King. Please note: Dave passed away February 9, 2000, before these tapes were transcribed and he had the opportunity to edit the draft.
    • Biologist Tranquilizes a Denning Black Bear

    • Work of the Service; Employees (USFWS); Wildlife management; Tagging; Monitoring; Boreal forests; Service patch
    • Wildlife biologist Mark Bertram carefully injects tranquilizer into a denning black bear in order to collect data and attach a radio collar which was part of a black bear breeding, denning, and movement study on the Yukon Flats National Wildlife...

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