I'm rethinking the purpose of the Letter requests. I want to reduce the amount of text and required reading. While the letters add some flavor there are just too many of them and they are not really that interesting. I'd rather give the player more freedom on what to focus on and also not lock too much content behind them. Most letters have been removed and replaced by smaller quantity of apprentice letters which serve more to teach the basics and other useful information.
Farming and foraging options are now part of the regular upgrade tree instead of locked behind letter requests.
Added some keyboard shortcuts to open the most used books for easy switching.
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