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*[http://www.quivis.co.uk/dum/index.html php?option=com_content&view=article&id=38&Itemid=38 Arthur David Linklater, Master Mariner] - Duncan Linklater's excellent site contains information on shipping and navigation in the early twentieth century, including details of Linklater's employment by the Calcutta Port Commission. With scans and transcripts of many original documents, exploring the site is recommended, but pages of particular general interest include::*[http://www.quivis.co.uk/dum/dumindex.php?option=com_content&view=article&catid=34%3Abiography&id=232%3Ahooghly-hooghly2.html 2&Itemid=64 Scan of pilot's certificate] for pilotage of the Hooghly:*[http://www.quivis.co.uk/dum/hooghlyindex.html php?option=com_content&view=article&id=41&Itemid=43 Some notes about the Hooghly]:*[http://www.quivis.co.uk/dum/hooghly-pilotage1index.html php?option=com_content&view=article&id=52&Itemid=84 Hooghly Pilotage ca. 1910]:*[http://www.quivis.co.uk/dum/dana/index.html php?option=com_content&view=article&id=259&Itemid=100 Dana's ''Dictionary of Sea Terms'' 1841/51]