We use
this one as well. It is quite handy. We have it taped up for quick reference.
We have a couple of those Starrett pocket reference charts also that we bring along to competition.
We got some really nice laminated charts with all the tap/clearance info on one side and decimal equivalents for metric, number, letter, and fractional drills on the other side. I keep one taped to the front of our mill and it's one of my most used tools. A local tooling supply company gives them out all the time. You may want to check with some around you.
I've never actually opened it up and folded it out, but KBC tools includes a large fold out drill/decimal equivalent chart in the middle of their catalogs. You can get as many as you'd like for free from their website.