Showing 1 - 3 results of 3 for search 'Helbing, Robert, b. 1869', query time: 0.02s Refine Results
  1. 1
    by Helbing, Robert, b. 1869
    Published 1915
    Berlin, Leipzig, G.J. G诳chen, 1915.
    138 p. front. 16 cm.
    Also issued online.
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  2. 2
    by Helbing, Robert, b. 1869
    Published 1898
    Karlsruhe, G. Braun, 1898.
    86 p. 22 cm.
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  3. 3
    by Helbing, Robert, b. 1869
    Published 1907
    G̈ottingen : Vandenhoeck und Ruprecht, 1907.
    xviii, 149 p. ; 25 cm.
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