From the PDF:
This beast is so large it almost defi es imagination. It is a mountain of living fl esh well over 100 feet in length from its blunt-snouted head to the tip of its long, lashing tail. It lumbers along on four Cyclopean legs, literally shaking the earth with each mammoth footfall.
The Argentinosaurus is a 2-page PDF detailing the largest land-animal ever known to have existed, with stats for the Pathfinder RPG system.