The Intercontinental Dictionary Series. ids.clld.org
Holthausen, Ferdinand (1963). Altenglisches Etymologisches Wörterbuch. 2. Auflage. Heidelberg: Carl Winter Universitätsverlag
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The element in question is marked in green.
When the etymological tree is displayed in hierarchical style, the nodes can be repositioned manually only within their level.
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This map shows the etymological links in a geographic context.