When Larry Tracy of East Windsor, Conn., a native of Caribou, returned to The County to work the harvest this year, he had no idea what a big harvest it would be. While working for Shawn Landeen of New Sweden, harvesters unearthed this huge Caribou Russet specimen that could dwarf a dinner plate, weighing 3 pounds and measuring 13 by 5 inches. Tracy showed off the spud at the Northeast Publishing office in Presque Isle on Oct. 12, and said it’s the largest potato he’s ever se