1831/1837—Chicago’s First U. S. Post Offices.
1860-1871—U. S. Custom House and Post Office
1878-1898—U. S. Government Building and Post Office
1896—Temporary U. S. Post Office
1901—Montague Letter Boxes
1904—U. S. Federal Building and Post Office
1904 Pneumatic Tube Mail System
1934—U. S. Post Office
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