10. Why is Pittsburgh called the “workshop of the world”?
11. Name two famous men of Pittsburgh and tell what they have done for the city and for the world.
12. Examine a map and find what shipping ports are within easy access of Pittsburgh.
13. Find by what route ore and other material shipped by way of the Great Lakes reach Pittsburgh.
[DETROIT]
In population, Detroit is the ninth city of the United States.
In the value of its manufactured products, it is fifth.