Ciphers Used In
Confidential Reports
(Oct. 1914-Sept. 1915)
——oOo——
| 5000 | I. G. Embassy |
| 7000 | ” ” Military Attache |
| 8000 | ” ” Naval Attache |
| 9000 | ” ” Commercial Attache |
| ———— | |
| 7354 | von Knorr |
| 7371 | Tomaseck |
| 7379 | Tokio |
| 7381 | Copenhagen |
| 7600 | Burns Agency |
| 9001 | Herbert Boas |
Random Pages from “P. K.’s Little Black Book”
SECRET SERVICE DIVISION.
SAFETY BLOCK SYSTEM
Operatives of the S. S. Division, when receiving instructions from me or through the medium of my secretary as to designating meeting places, will understand that such instructions must be translated as follows:
For week Nov. 28 to Dec. 4 (midnight)
A street number in Manhattan named over the telephone means that the meeting will take place 5 blocks further uptown than the street mentioned.