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==External links==
*[http://archiver.rootsweb.ancestry.com/th/read/INDIA/2010-02/1265881336 Rootsweb India mailing list] This thread is about oil companies and their workers.
*[http://www.slb.com/~/media/Files/resources/mearr/num1/exploration.ashx "Elephants, exploration and Engineering"] Schlumbergers’ ''Middle East & Asia Reservoir Review'' Volume 1, 2000.
=== Historical books online ===
