File:National Highway Program - Trends in Travel and Gross National Product.png
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![File:National Highway Program - Trends in Travel and Gross National Product.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/99/National_Highway_Program_-_Trends_in_Travel_and_Gross_National_Product.png/790px-National_Highway_Program_-_Trends_in_Travel_and_Gross_National_Product.png?20220602144313)
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