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Why teaching people about invasive plants can get a little thorny

Why teaching people about invasive plants can get a little thorny
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Allegheny national forestUnited statesMason herberlingSarah crawfordJulie grantRachel reebLaurie giarrataniMason herblingAllegheny national forest in northwestern pennsylvaniaRichard king mellon foundationAudubon society of western pennsylvaniaCarnegie museum of natural history in pittsburghCarnegie museum of natural historyCarnegie museum of natural history japaneseCarnegie museumNatural history