Ultimate Guide to Alchemy, Crafting & Enchanting by Nord Games is one of the many Role Playing Game resources that I have in my library. 

I love world building.  One of the keys to making a world functional for stories is to have the actions and reactions of the world follow rules.  They may not be rules you tell your readers about.  But if pulling the level makes the door open, then the doors should open when you pull the lever... or a surprise should occur.

Books like this one, I use as inspiration for how to do world building.  What do you think about? how do you quantify it?  You don't need to go to the level that games do to make things work, of course.  But having thought about it, it at least makes things consistent, which reduces reader's confusion, which increases reader's satisfaction.

This particular book, is an interesting look into the creating of potions and magical artifacts.  Very handy if you have a magic filled world.  Or if you want to create that extra special McGuffin.

Fun book, nice art.