* In Besaid, to the right of the main temple.
* on the SS Liki in the bridge
* at Luca, in the stadium in the basement
* On the Miihen high road, at the end of the lower road
* on the Mushroom Rock road near the save sphere
* at the south Shoopuf area
* in Thunder Plains, half way in by a tower, on the right
* after killing the Spherimorph in the woods
* in Macalania Woods, by the lake (southern area)
* on Gagazet Mountain
(From the walkthrough)
There is no way of telling which one's you already have. :rolleyes: <img src="/images/graemlins/tongue.gif" alt="" />