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Charlemagne's Summit Canal: An Early Medieval Hydro-Engineering Project for Passing the Central European Watershed
- Christoph Zielhofer,
- Eva Leitholdt,
- Lukas Werther,
- Andreas Stele,
- Jens Bussmann,
- Sven Linzen,
- Michael Schneider,
- Cornelius Meyer,
- Stefanie Berg-Hobohm,
- Peter Ettel
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- Published: September 24, 2014
- https://doi.org/10.1371/journal.pone.0108194