**REPRINT** Pneumatic tube service. Report of the Postmaster-general to Congress, relative to the investigation of pneumatic-tube systems for the transmission of mail, authorized by the act of June 2, 1900. Washington. Govt. Print. Off., 1901.**REPRINT**

**REPRINT** Pneumatic tube service. Report of the Postmaster-general to Congress, relative to the investigation of pneumatic-tube systems for the transmission of mail, authorized by the act of June 2, 1900. Washington. Govt. Print. Off., 1901.**REPRINT**

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**REPRINT** Pneumatic tube service. Report of the Postmaster-general to Congress, relative to the investigation of pneumatic-tube systems for the transmission of mail, authorized by the act of June 2, 1900. Washington. Govt. Print. Off., 1901.**REPRINT**

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