File:Report on the Pittsburgh Transportation Problem 1910 a.jpg
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![File:Report on the Pittsburgh Transportation Problem 1910 a.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0f/Report_on_the_Pittsburgh_Transportation_Problem_1910_a.jpg/371px-Report_on_the_Pittsburgh_Transportation_Problem_1910_a.jpg?20210520180243)
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