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  1. Definition and use of the phi grade scale / by R.D. Hobson.
    By: Hobson, R. D. - Coastal Engineering Research Center (U.S.)
    Publication info: Fort Belvoir, Va. :National Technical Information Service, Operations Division [distributor,1979]
    Holding Institution: MBLWHOI Library
    Subjects: Classification  Particle size determination  Soils  
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