Since 2004 I have contributed to the Journal of the Missouri Numismatic Society. It is distributed in paper form at the MNS coin show in July, and soon after are availalble on the Newman Numismatic Portal as hosted by Washington University in St. Louis.
Calkins. Half Dimes of 1853 Missouri Journal of Numismatics, Volume 48, July 2023, pp19-21
Calkins. A Droz Pattern Halfpenny Missouri Journal of Numismatics, Volume 48, July 2023, pp22-24
Calkins. Soviet Spaceflight Medallions Missouri Journal of Numismatics, Volume 47, July 2022, pp21-33
Calkins. Chernobyl Remembered Missouri Journal of Numismatics, Volume 47, July 2022, pp47-52
Calkins. Numismatics of Darker Times Missouri Journal of Numismatics, Volume 46, July 2021, pp42-64
Calkins. Coins of Iron City Missouri Journal of Numismatics, Volume 44, July 2019, pp36-41
Calkins. Lithuanian Coinage Missouri Journal of Numismatics, Volume 44, July 2019, pp16-30
Calkins. Firearms in Numismatics Missouri Journal of Numismatics, Volume 43, July 2018, pp54-65
Calkins. Cryptocurrencies Missouri Journal of Numismatics, Volume 42, July, 2017 pp18-28
Calkins. A Look at Schillings of the Free Imperial City of Riga, Part 2 Missouri Journal of Numismatics, Volume 39 July, 2014, pp27-45
Calkins. A Look at Schillings of the Free Imperial City of Riga Missouri Journal of Numismatics, Volume 38 July, 2013, pp35-41
Calkins. A Coin of Viminacium Missouri Journal of Numismatics, Volume 29, July 2004, pp8-11