There are many, many versions of this sort of thing. I consider them mandatory - and excellent job digging one up! I call them a "chord bible." I strongly urge new players to invest in a physical copy of a chord bible. The best ones are in binders. Not really ring-binders, but those plastic thingies with lots of teeth that go through many rectangular holes that were punched into the paper for binding. They have another name, but I am unable to think of it at the moment. These will lay flat. If they're good, they'll have room in 'em so that you can take notes in there and they'll have a format that you can easily navigate to. The problem is, they often have too many chords. They all compete on the total number of chords, so you end up with like 150 ways to play a Fm7thSup3rdDim - which is probably not useful to anyone - including me. Why no, no I don't know 'em all. So, they needn't be dreadfully thick or anything - just complete enough for your needs. Which is pretty much any of 'em! That's why I think the best feature is that it be bound in a way that lays flat and has enough room to make notes.