Snorkel (submarino) (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Snorkel (submarino)" in Spanish language version.

refsWebsite

Global rank Spanish rank

800^th place

3,593^rd place

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5^th place

archive.org

Ireland, Bernard (2003). Battle of the Atlantic. Barnsley, UK: Pen & Sword Books. pp. 187. ISBN ISBN 0 84415 001 1 |isbn= incorrecto (ayuda).

espacenet.com

worldwide.espacenet.com

GB 106330 (A) - Improvements in or relating to Submarine or Submersible Boats. Scott's Shipbuilding & Engineering Co., and Richardson, James. May 19, 1916.