I've found some video's of potato growing and harvesting from the U of Maryland
Planting video with 4 planting styles
http://www.youtube.com/watch?v=1ua0rOrISFk
Harvesting video with total weight per style of planting.
http://www.youtube.com/watch?v=Puqyf...eature=channel
Another random patato harvest video.
http://www.youtube.com/watch?NR=1&v=XxgKHnMsP4k