I came across these Original Dungeons & Dragons reference sheets a few years ago. I don’t remember where they came from, and the PDF properties don’t list an author (if anyone knows who put them together, let me know so I can give proper credit – thanks to the commenter below –  they are from the Fear No Darkness blog). I keep them at my side while I’m running my Nolenor OD&D sessions, and I find them extremely useful. They have just what you need for a 3LBB game on three landscape pages, including common rolls, missile weapon ranges (taken from Chainmail), monster reaction, and the usual attack tables, turn undead and wandering charts. All with some great, classic pieces of art. Click on the image to download. Discussion here.