Don't worry about the 2001-D. It's common. I find a ton of them all the time out here. Just look up the mintages and it'll tell the ones that you should be keeping. You can also look at Ebay to see what sells. People just can't get rid of 2001-D rolls on Ebay. Just a check on Ebay 2000-D rolls sell for a higher premium than 2001-D.