Forgotten Weapons: Stonebow

From publisher blurb:

The Stonebow. An ancient weapon designed to work much like a crossbow, but using stones as it's primary ammunition. This new series from The Le Games and Chaos Drake Press takes a look at this fascinating weapon and gives you all of it's glorious d20 stats for use in your campaign world. Inside you will find everything you need to know about the Stonebow, Repeating Stonebow, and the Stonebow Sworn (prestige class). But wait, there's more. Also included are brand new feats and new spells, to better balance out this marvelous weapon.