When used in telegraphic correspondence between Baghdad and Political Offices in Occupied Territories, Tehran, Cairo, Constantinople, and the Government of India in 1917, 20 blank groups in the Foreign Office Cypher Code were used to identify specific names.

Keywords	A.T. Wilson Tehran Persian Gulf
Ministry/ Department/ Residency	Foreign and Political
Branch	Cypher Confidential
From Year / Date (YYYY-MM-DD)	1920
To Year / Date (YYYY-MM-DD)	1920
Source Organization	NA
Identifier	PR_000006019494
File No./Reference No./Sheet No./Folio No.	15
Location	Repository-3
Part No.	NA
File Size	90.0 MB
Pages	173
Collection	Digitized Public Records Foreign and Political
Call Number	NA
Publisher	NA
Subject	NA
Creator	NA
Accession Number	NA
Series	NA
Year of Publication	NA
Language	English
Bundle Barcode	NA
Location Code	NA
File Barcode	NA