1716, An extract from: John Perry, The State of Russia under the present Czar.
1710, Add Mss 37359, British Library, Whitworth Papers re Perry.
1739, The History of the Life of Peter I, Emperor of Russia, re Perry.
2001, Report on Canals on the Solovki Islands, in the White Sea.
1915 translated article from Wasserwirtschaft re the Oginski Canal, with 1843 map.
Section on the Oginski and Royal Canal from Polish Encyclopedia.
Steam tug Nadbor - history.
Steam tug Nadbor - condition report.