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  1. 1
    by Helwig, Paul Iwan
    Published 1897
    Amsterdam, Delsman and Nolthenius, 1897.
    vi, 87 p. 23 cm.
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  2. 2
    by Helwig, Paul Iwan
    Published 1901
    Amsterdam, Delsman & Nolthenius, 1901.
    6 p. l., 79 p. diagr. 30 cm.
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