One thing has bothered me ever since the science system came out, how are we going to add books to our isle's. As soon as we first saw science for Geologists it was obvious how books were going to be added to General and Explorers, not so for Islands.

May I suggest adding the Island book interface to the Tavern. This would then provide a use for a building which once you have purchased all 12 of it's NPC's is virtually useless.