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[http://en.wikipedia.org/wiki/Khyber_Rifles Khyber Rifles] Wikipedia<br>[http://www.khyber.org/pashtohistory/frontiercorps/khyberrifles.shtml The Khyber Rifles] Khyber.org<br>[http://en.wikipedia.org/wiki/Robert_Warburton Colonel Sir Robert Warburton KCIE CSI] Wikipedia<br> ==== Historical books on-line ====[http://www.archive.org/stream/cu31924020369108#page/n12/mode/1up '' Eighteen years in the Khyber, 1879-1898''] by Colonel Sir Robert Warburton KCIE CSI 1900