Batista Vieira, A. A. and da Silva Costa, F. 2017. The 1909 river Douro flood: a contribution to its study from the historical archives of the portuguese environmental agency. Investigaciones Geográficas. 53 (Jul. 2017), pp. 77–92. DOI:https://doi.org/10.5354/0719-5370.2017.43598.