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1Published 1917“...Department of Civil Engineering-Ruhr-Universitat B...”
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2by GENDTJR, J. G. Van“...Department of Civil Engineering-Ruhr-Universitat B...”
Published 1911
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3by SIEFFERT, Jean-Georges“...Department of Civil Engineering-Ruhr-Universitat B...”
Published 1991
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4by SIEFFERT, Jean-Georges“...Department of Civil Engineering-Ruhr-Universitat B...”
Published 1991
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5Published 1917“...Department of Civil Engineering-Ruhr-Universitat B...”
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6by GENDTJR, J. G. Van“...Department of Civil Engineering-Ruhr-Universitat B...”
Published 1911
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