Leap Pad

OK I was going crazy this summer on finding leap pads learning systems with the books and cartidges. I finally found one this summer at a garage sale. Since then I have been going crazy looking for the books and cartridges. I have 1 Leap pad learning system plus writing, 1 leap pad learning system, 2 my first leap pad learning systems and a fisher price power touch learning system. All of these i have found at garage sales, once upon a child or goodwill. So my question is, since i have all these systems, i also bought a bunch of books that i found at goodwill, shopgoodwill.com and once upon a child, my question is how do you figure out which books go to which system?? I have looked at leappad.com and all those websites but nothing has helped. Was just wondering if you ladies know of a spot on the book to tell which system it goes to? Thanks

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