WOW. What used to be an incredibly useful webpage has now become an insanely useful page. I could not believe the depth and quality of the images, descriptions, and information. I don't even want to know how much work went into that overhaul. That is absolutely revolutionary.
I'm not sure if I'd ever gone there before but one of the first articles I've now read is really good. https://www.coppercoins.com/learn/design-types-and-design-varieties Lots of these have been discovered in the Barber series over the past 7 years and I bet there's more in the Lincoln cents awaiting discovery.