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Drummond Matthews Drummond, Wisconsin Drummondita hassellii Drummondia obtusifolia Drummondita fulva Drummondita longifolia Drummondita calida Drummondia rubiginosa Drummondita miniata Drummondia canadensisTài liệu tham khảo
WikiPedia: Drummond Matthews http://books.google.ch/books?hl=de&lr=&id=MoNitvDv... //dx.doi.org/10.1038%2F199947a0 http://www.geolsoc.org.uk/gsl/null/lang/en/page750...