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By: Hufford, Herbert Grosvenor,Edition:Publication info: [Indianapolis?], [publisher not identified], [1891]Volume:Series:Holding Institution: Boston Public LibrarySubjects: Natural history Natural Sciences Nature observationBHL Collections:
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By: Harrison, Robin T. - Equipment Development Center (San Dimas, Calif.)Edition:Publication info: San Dimas, Calif, U.S. Dept. of Agriculture, Forest Service, Equipment Development Center, [1984]Volume: 1984Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects: Birds of prey Monitoring Nature observation Optical instrumentsBHL Collections: