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WikiPedia: Ngultrum Bhutan http://www.rma.org.bt http://www.rma.org.bt/RMA%20Publication/Annual%20R... http://www.rma.org.bt/historialp.jsp http://banknotenews.com/files/21b9f1812326ed288a55... http://banknotenews.com/files/tag-bhutan.php https://www.bob.bt/about/