3-Point Hitch 3 point hitch rock drill?

[shakman]

I have a NH TC29 and I was wondering if there was such a beast as a rock drill that will attach to the 3-pt hitch on my tractor. I have do drive a large number of t-posts for some fencing, but I have solid limestone 6" under the soil on my property (gotta love central Texas!)

If there is such a thing, can someone point me in the direction that I could find one to rent/buy?

Thanx!