Before revision: Notable geographers upPtolemy "the Alexandrian", as depicted in a 16th-century engraving upGerardus Mercator upMei-Po Kwan Alexander von Humboldt (1769–1859) – published Cosmos and founder of the sub-field biogeography.
After revision: Notable geographers upGerardus Mercator upMei-Po Kwan Alexander von Humboldt (1769–1859) – published Cosmos and founder of the sub-field biogeography.