With each passing year, mountains of aging film stock shot in the last century nudge closer to becoming unviewable. And as that happens, more and more Hollywood studios are looking seriously at preserving the classics stored in their vaults. An executive from Paramount Studios spoke to students at the Univeristy of Minnesota today about the importance of restoring old films. Barry Allen's recent preservation work includes Nicolas Ray's "Johnny Guitar" and the 1949 classic, "The Red Pony." Allen says the old films are national treasures: