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This publication is protected and can be accessed only from certain IPs.

Title: Eine neue Art der Gattung Aphis L. (Homoptera, Aphididae) an Knautia arvensis (L.) COULT. aus Polen = Nowy gatunek rodzaju Aphis L. (Homoptera, Aphididae) na Knautia arvensis (L.) COULT. z Polski

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