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Harpoon IV
Combatsim.com: Harpoon 4 Preview, Larry Bond's Harpoon 4
more
Harpoon HQ
http://www.harpoonhq.com/
Offers scenarios, troubleshooting, game information, and articles.
The HULL: The Harpoon Users League List
http://www.teuton.org/mailman/listinfo/hull
Group of players using forums to discuss the game. Membership is required.