Cover image for Investigations as to pneumatic-tube service for the mails.
Investigations as to pneumatic-tube service for the mails.
Title:
Investigations as to pneumatic-tube service for the mails.
Author:
United States. Post Office Department.
Corporate Author:
United States. Post Office Department.
Publication Information:
Washington, [publisher not identified], 1909.
Physical Description:
143 pages ; octavo
Language:
English
Format :
Book

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