File:Humboldt's System of Isothermal Lines, or Lines of Equal Annual Mean Temperature Over the Globe.jpg
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![File:Humboldt's System of Isothermal Lines, or Lines of Equal Annual Mean Temperature Over the Globe.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/Humboldt%27s_System_of_Isothermal_Lines%2C_or_Lines_of_Equal_Annual_Mean_Temperature_Over_the_Globe.jpg/712px-Humboldt%27s_System_of_Isothermal_Lines%2C_or_Lines_of_Equal_Annual_Mean_Temperature_Over_the_Globe.jpg?20201101083206)
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