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===Historical books online===
*[http://archiv.ub.uni-heidelberg.de/savifadok/volltexte/2013/2777 ''An outline of postal history and practice with a history of post office of India''] by Ivie George Joseph Hamilton 1910. Download from Heidelberg University Digital Repository South Asian Studies. Also available [https://archive.org/details/dli.ministry.04961/page/1/mode/2up Archive.org], mirror from Ministry of Culture/National Library of India, but note some pages near the front of the book appear to be , together with pages 129-174 are '''missing ''' in the latter version.
*[http://archive.org/stream/postofficeofindi00claruoft#page/n7/mode/2up ''The Post Office of India and its Story]'' by Geoffrey Clarke, Indian Civil Service 1921 Archive.org. “With sixteen illustrations”
*[http://archive.org/stream/cu31924012679548#page/n7/mode/2up ''The Post Office of India in the Great War''] edited by H.A. Sams 1922 Archive.org. [http://archive.org/stream/cu31924012679548#page/n11/mode/2up Contents]
:Probable [https://archive.org/details/in.ernet.dli.2015.548621/page/n1 1903 edition], (although not cataloged as such) Archive.org, Public Library of India Collection. Generally poor quality print.
:[http://nla.gov.au/nla.obj-412337031 ''Henry S. King & Co.'s Hand book for homeward-bound travellers from India, Australia and the East''] 1893 National Library of Australia. Includes the [http://nla.gov.au/nla.obj-412337031/view?partId=nla.obj-412339007#page/n12/mode/1up telegraph code] to be used, (from page 12) as words or phrases more than ten letters are charged double.
:[https://archive.org/details/dli.ernet.199750/mode/2up ''Word Code For Foreign State Telegrams, compiled for the Government of India. Part II-Code Phrase''] by J H Lane Indian Government Telegraph Department. 4th Edition prepared under the direction of J J Allen. Archive.org. [https://archive.org/details/in.ernet.dli.2015.115584/page/n3/mode/2up Another file, easier to read in parts] but some pages towards the back are scanned/printed upside down. Archive.org. Elsewhere 4th edition was published 1903 (3rd edition 1890 in two volumes Part 1 Phrase, Code]
:Article [http://www.cs.columbia.edu/~CS4HS/talks/codebooks.pdf "Compression, Correction, Confidentiality, and Comprehension: A Look at Telegraph Codes"] by Steven M. Bellovin "Preliminary version – March 25, 2009". cs.columbia.edu
:Article [https://www.jmcvey.net/cable/government/index.htm government and colonial administration codes] jmcvey.net
===Indo-European Telegraph===
