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...Martin-Vide, J. (2020): Meteorological drought lacunarity around the world and its classification, Earth Syst. Sci. Data, 12, 741–752, [[doi:10.5194/essd- ...nion of the points of equal frequency of occurrence and different duration and intensity<ref>Témez, J. (1978): Cálculo Hidrometeorológico de caudales máxi ...

...ycle|cycling]] within a system is controlled by many biological, chemical, and physical processes. ...itrogenNaturalSources.html|title=Natural Sources of Nitrogen {{!}} Sources and Pathways {{!}} Environmental Assessment Program {{!}} Washington State Depa ...

...ame=waterfootprintorg>{{cite web|title=Waterfootprint.org: Water footprint and virtual water|url=https://www.waterfootprint.org/water-footprint-2/g/?page= ...s consumed in their country of origin. International trade of agricultural and industrial products in effect creates a global flow of [[virtual water]], o ...