On the ecology of two varieties of Sonchus arvensis L. / Dirk Michiel Pegtel
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On the ecology of two varieties of Sonchus arvensis L. / Dirk Michiel Pegtel
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Proefschrift Groningen
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On the ecology of two varieties of Sonchus arvensis L.
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On the ecology of two varieties of Sonchus arvensis L. / Dirk Michiel Pegtel