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This illustration dates to the 1870s and shows a well-designed Travelling Post Office. In such
UMG25A05_350

This illustration dates to the 1870s and shows a ...

The Pneumatic Despatch Tube.
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The Pneumatic Despatch Tube.

Col du Mont Cenis
UMG23A36_208

Col du Mont Cenis

Diagram of Tennessee Valley Authority Water Control System
UMG22A49_214

Diagram of Tennessee Valley Authority Water Contro...

Naval Military Map of the United States 1862
UMG20A03_099

Naval Military Map of the United States 1862