Telegraphic cipher code. Gerrish system.
|Corporate Author:||Harvard College Observatory.|
|Other Authors:||Gerrish, Willard Peabody.|
Cambridge, The Observatory, 1906.
Cipher and telegraph codes
"The system and code were devised by Mr. Willard P. Gerrish, of this Observatory, who has prepared the following description and instructions." -- Pref.
At head of title: Harvard College Observatory.
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