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*From 1794 the brighter students at the Madras Male Orphanage, usually boys of mixed blood, were recruited to the Survey school.<ref> Rootsweb India List post [http://archiver.rootsweb.ancestry.com/th/read/INDIA/2011-02/1298802118 Revenue Surveyor] by Shirley West 27 Feb 2011 (retrieved 14 April 2014)</ref>

*[http://www.holdiches.com/sir-thomas-hungerford-holdich-1843-1929/ Sir Thomas Hungerford Holdich 1843 – 1929] His Life Story, Chapters 1-5 cover his time in India. (click on the drop down menu). He became a Royal Engineer and he was sent to India on attachment to the Survey Department. His first campaign was in [[Duar War|Bhutan in 1865]]. This led to his permanent appointment to the Survey Department. He subsequently served in the [[2nd Afghan War]]. he was appointed as Surveyor to the Historical Boundary Commission which was to settle the boundary between Russia and Afghanistan, and then Chief Commissioner to settle the boundary between Persia and Baluchistan He was involved with the [[Tirah Campaign|1898 campaign against the Afridis]], but soon had to retire as he had reached the age of 55. The Holdich Family History Society (retrieved 14 April 2014). [http://en.wikipedia.org/wiki/Thomas_Holdich Thomas Holdich] Wikipedia. For online books, refer below.

*[https://web.archive.org/web/20131126124906/http://www.himalayanclub.org/journal/obituary-5/ Obituary of Colonel Reginald Henry Phillimore 1879-1964] himalayanclub.org (archive.org link)

*[http://www.rics.org Royal Institution of Chartered Surveyors - RICS], with headquarters in London has a Library enquiry service for Family History and will search the archives for a fee, for biographical details of chartered surveyors. For the relevant website page, select Knowledge/Enquires & library/Library services/Library enquiry service.