Supply to Captain W.L. Campbell, British Trade Agent at Yatung of copies of all Cypher telegrams sent of received by Chinese officials in the Chumbi Valley. Discovery of a 'Key' to the Chinese Cypher by Captain Campbell

Keywords	Cheung Yuk Tong
Ministry/ Department/ Residency	Foreign
Branch	Confidential B External C
From Year / Date (YYYY-MM-DD)	1907
To Year / Date (YYYY-MM-DD)	1920
Identifier	PR_000006228785
File No./Reference No./Sheet No./Folio No.	File No. 45506
Location	Repository-3
File Size	23.1 MB
Pages	40
Collection	Digitized Public Records Foreign
Language	English