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Charlemagne's Summit Canal: An Early Medieval Hydro-Engineering Project for Passing the Central European Watershed
Zielhofer C,
Leitholdt E,
Werther L,
Stele A,
Bussmann J,
et al.
(2014)
Charlemagne's Summit Canal: An Early Medieval Hydro-Engineering Project for Passing the Central European Watershed.
PLOS ONE 9(9): e108194.
https://doi.org/10.1371/journal.pone.0108194