Eagle Relay/Power Jack Libraries

Are thier and power jack libraries out their for Eagle? I see only one power jack in the eagle stock library, and it has very small pins. I can make my own, but I figured something as common as a power jack would already be made.

Also, I know that eagle has a vast library of relays, but how do I tell which relay I am looking for? The only way I hve been able to do it so far is to go through all of them and look for one that has the same footprint as mine. After that I print it off and see if my relay fits. Can I be taught how to read all those crazy numbers/letters?

Thanks!