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Durk Houtsma - Archive: NMBS 08530 (IR 3915)
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Durk Houtsma - Archive: NMBS 08141 (L 2860)
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Durk Houtsma - Archive: NMBS 08142 (L 2861)
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Durk Houtsma - Archive: NMBS 08077 + 08156 (IC 1836)
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Durk Houtsma - Archive: NMBS 08543 + 08095
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Durk Houtsma - Archive: NMBS 08112