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  1. 1
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    Special propeller protractor / by Heim, A. L.

    Published 1928
    Online Access
    Government Document eBook

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  2. 2
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    Specifications for 3-arm protractor

    Published 1900
    Government Document Microfilm Book

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  3. 3
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    A Bureau of Mines direct-reading azimuth protractor / by Bolstad, D. D. (Douglas D.), Mahtab, M. A. (M. Ashraf)

    Published 1973
    Search for the full-text version of this title in HathiTrust
    Government Document Book

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  4. 4
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    Aerial photo scale-protractors for mountainous areas / by Moessner, Karl E. (Karl Edward), 1907-

    Published 1956
    Government Document Book

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  5. 5
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    A manual of the protracting trigonometer with its application to rectilinear draughting and plotting, trigonometry, and surveying / by Lyman, Josiah

    Published 1862
    Full Text (via Gale)
    Electronic eBook

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