two things i would HIGHLY RECOMMEND are the Anesthesia pocket card
http://www.amazon.com/Anesthesiology...8057456&sr=8-2

and the Regional anesthesia pocket guide

http://www.amazon.com/Regional-Anest...8057411&sr=8-1

These 2 tools fit into ur scrub pocket and have all the essentials. i carry both in the OR with me bec. i cant take any books or bags in there, and if u r doing a rotation, its nice to have the info on ur finger tips to impress ur attending also. You can find them on amazon.com