Investigations as to pneumatic-tube service for the mails.
|Corporate Author:||United States.|
Washington : G.P.O., 1909.
> United States.
Pneumatic-tube transportation > United States.
"December 15, 1908.--Referred to the Committee on the Post-Office and Post-Roads and ordered to be printed with illustrations."
143 p.,  leaves of plates (folded) :
2 maps ;
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