
This would be a quick indicator on which book to use. I currently use multiple books because I split the plans up into what I consider logical groups.
I have 3 libraries right now. I am thinking about adding another and I am starting to realize that I have to stop and look at the different books way too long to choose the right one because I find them difficult to tell apart. I have 1 full of rail plans. I have 1 for general stuff, and I have 1 for belt balancers(from the wiki).