Yes I have been doing a LOT of reading and will have to do a lot more! I only recently started looking at Varieties, even though I have been collecting for 50 years. I try to wait until I have 5 full roll of a particular coin by year and mint before inspecting, it make the reading lighter for that search. Then I search all the sights I can find to see what was found before. It is going to take me a VERY long time to get to any of the Philly mint coins or more trips to the east coast. All I get in Sacramento are Denver and the occasional older SF coin. I have my doubts I will figure out the "extra thickness" varieties.