The Great War at Sea, Volume 1 - The Mediterranean  
   An Operational and Tactical level game of World War I Naval operations in the Mediterranean and Black Sea. Every ship that fought for England, Germany, Austria, Italy, Russia, Greece, Rumania, and France is provided.
   http://www.avalanchepress.com/gameGWAS1.html

Ironclads at War  
   Scenarios, variants and maps for use with the Great War at Sea System, Shipbase and other naval miniatures rules for the period of 1880-1930.
   http://www.geocities.com/jwilliams1454/search.htm

The Great War at Sea, Volume 2 - The North and Baltic Seas  
   An Operational and Tactical level game of World War I Naval operations in the North and Baltic Sea. Every ship that fought in those seas for England, Germany, Russia, Sweden, and France is provided along with some U.S., Japanese, and Brazillian units.
   http://www.avalanchepress.com/line_GWAS.php