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1903-03-10 (1)
1906 (1)

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 Image: Title: Subject: Description:

1. Underground tunnel railway Underground tunnel railway Post offices Caption: "The first mail arriving at the Post Office station of the Chicago subway or underground railroad, March 10, 1903."

2. Post Office pneumatic tube system Post Office pneumatic tube system Post offices; Pneumatic tubes Caption: "End of the big pneumatic tube system in the basement of the Chicago Post Office." From text: "The underground pneumatic tube system is the largest of the kind in the world. There are three double-tube...
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