Published works by Chip Scoppa, proprieter of iCoins:
East Meets West – an article written by Chip describing a “mule” coin from Ancient Roman times
Roman Minted Coins: a slideshare made for the RNA Coin Show 2012
Mint Marks on Old And New Coins – a writeup of Chip’s presentation to the Brighton Rotary Club
Mint Marks and Control Marks – a slideshare on coin markings
Red “R” And Red “S” Revisited – printed in The Numismatist magazine and received an award for third place in The Catherine Sheehan Literary Award For U.S. Paper Money Studies
The Coins of Probus – an article written by Chip describing a coded series of mintmarks
Mentions of Chip’s Work and Ideas:
https://www.cointalk.com/threads/r-experimental.216815/