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Fulgurit FulgurotheriumTài liệu tham khảo
WikiPedia: Fulgurit http://amsglossary.allenpress.com/glossary/browse?... http://environment.newscientist.com/channel/earth/... http://plaza.ufl.edu/rakov/Gas.html http://ira.usf.edu/CAM/exhibitions/1998_12_McCollu... http://www.yale.edu/opa/arc-ybc/v34.n30/story3.htm... http://geology.utah.gov/surveynotes/gladasked/glad... http://allanmccollum.net/amcimages/pdffiles.html http://www.mindat.org/min-7747.html http://www.minsocam.org/MSA/collectors_corner/arc/...