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*[http://www.quivis.co.uk/dum/index.php?option=com_content&view=article&id=38&Itemid=38 html 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/indexdum/images/portrait/675x900/pilot.php?option=com_content&view=article&catid=34%3Abiography&id=232%3Ahooghly-2&Itemid=64 jpg Scan of pilot's certificate] for pilotage of the Hooghly:*[http://www.quivis.co.uk/indexdum/hooghly.php?option=com_content&view=article&id=41&Itemid=43 html Some notes about the Hooghly]:*[http://www.quivis.co.uk/indexdum/hooghly-pilotage1.php?option=com_content&view=article&id=52&Itemid=84 html Hooghly Pilotage ca. 1910]:*[http://www.quivis.co.uk/dum/dana/index.php?option=com_content&view=article&id=259&Itemid=100 html Dana's ''Dictionary of Sea Terms'' 1841/51]