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https://www.nist.gov/publications/climatic-charts-surface-refractivity-germany
Climatic charts of the surface refractivity for Germany: | NIST
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https://ijnscfrtjournal.isrra.org/Natural_Sciences_Journal/article/view/1356
Radio Refractivity and Gradient Variations Across West Africa Climatic Zones: Implications for...
west africa
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