From publisher's item description:
"The Swords & Wizardry Reference Sheets provide ready access to the charts, tables and summary information for a Game Referee to run wilderness and dungeon adventures. No need to flip through a rulebook when you can have all the information you need in an easy to use digest format!
These sheets, formatted for convent digest printing on 8.5x11 (US letter) paper, combine existing Open Game Content from Swords & Wizardry Core Rules - 3rd printing, David Bowman's Monster by CL lists, and brand new content for wilderness encounters and revamped Treasure Generation tables. The PDF also includes basic booklet printing instructions.
This accessory is inspired by the set of Reference Sheets that came with some printings of the original 1974 fantasy roleplaying game."