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  1. 1

    Petrochemical calculations based on equivalents (methods of Paul Niggli) by Burri, Conrad, 1900-

    Published 1964
    Book

    Petrochemical calculations based on equivalents (methods of Paul Niggli)
  2. 2

    Petrochemical calculations. by Burri, Conrad

    Published 1964
    Book

    Petrochemical calculations.

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