Over the last few years, I've written a number of articles and given presentations on Software Engineering, Geology and mineral collecting, and Numismatics, many of which are listed here.

Calkins. Community Currencies in Missouri (and Elsewhere) Missouri Journal of Numismatics, Volume 49, July 2024, p15-38

Calkins. Colonial Massachusetts Cents and Their Evanson Restrikes Missouri Journal of Numismatics, Volume 49, July 2024, p61-70

Calkins. Half Dimes of 1853 Missouri Journal of Numismatics, Volume 48, July 2023, p19-21

Calkins. A Droz Pattern Halfpenny Missouri Journal of Numismatics, Volume 48, July 2023, p22-24

Calkins. Soviet Spaceflight Medallions Missouri Journal of Numismatics, Volume 47, July 2022, p21-33

Calkins. Chernobyl Remembered Missouri Journal of Numismatics, Volume 47, July 2022, p47-52

Calkins. Numismatics of Darker Times Missouri Journal of Numismatics, Volume 46, July 2021, p42-64

Calkins. Coins of Iron City Missouri Journal of Numismatics, Volume 44, July 2019, p36-41

Calkins. Lithuanian Coinage Missouri Journal of Numismatics, Volume 44, July 2019, p16-30

Calkins. Firearms in Numismatics Missouri Journal of Numismatics, Volume 43, July 2018, p54-65

Calkins. Cryptocurrencies Missouri Journal of Numismatics, Volume 42, July, 2017 p18-28

Calkins. A Look at Schillings of the Free Imperial City of Riga, Part 2 Missouri Journal of Numismatics, Volume 39 July, 2014, p27-45

Calkins. A Look at Schillings of the Free Imperial City of Riga Missouri Journal of Numismatics, Volume 38 July, 2013, p35-41

Calkins. Coins and the Bible presentation to St. Louis Bible Fellowship, July 2007
Slides: [Part 1] [Part 2] [Part 3] Audio: [Part 1] [Part 2] [Part 3]

Calkins. A Coin of Viminacium Missouri Journal of Numismatics, Volume 29, July 2004, p8-11

The MNS Journals can also be found at the Newman Numismatic Portal.

Calkins. Reactive OpenDDS, Part II: Operators OCI Middleware News Brief, 2015, no 1

Calkins. Reactive OpenDDS, Part I OCI Middleware News Brief, 2014, no 1

Calkins. Pathfinding with A* OCI Software Engineering Tech Trends, October 2014

Calkins. JVM to .NET Interop OCI Software Engineering Tech Trends, May 2014

Calkins. Scala and the Play Framework OCI Software Engineering Tech Trends, January 2014

Calkins. Scala and the Play Framework presentation given at an Object Computing, Inc. Tech Lunch, May 31, 2013

Calkins. Multi-Platform Serial Interfacing using Boost: A GPS Sensor and OpenDDS Part II OCI Middleware News Brief, 2013, no 4

Calkins. Multi-Platform Serial Interfacing using Boost: A GPS Sensor and OpenDDS Part I OCI Middleware News Brief, 2013, no 3

Calkins. CORBA, Part II: .NET Development using IKVM, Topshelf and IIOP.NET OCI Middleware News Brief, 2013, no 2

Calkins. CORBA, Part I: Java and the Web using the Play Framework OCI Middleware News Brief, 2013, no 1

Calkins. Building with MPC presentation to Computer Science 507 (Software Engineering), College of St. Rose, January 28, 2013

Calkins. MPI and DDS (Not?) So Different OCI Middleware News Brief, 2012, no 1

Calkins. Erlang presentation given at an Object Computing, Inc. Tech Lunch, February 18, 2011

Calkins. Using Erlang with CORBA and DDS OCI Middleware News Brief, 2011, no 1

Calkins. Large Image Display with Seadragon Ajax OCI Software Engineering Tech Trends, October 2011

Calkins. GPU Computing with OpenCL OCI Software Engineering Tech Trends, July 2011

Calkins. C# presentation given at an Object Computing, Inc. Tech Lunch, September 17, 2010

Calkins. Using Futures to Simplify CORBA AMI OCI Middleware News Brief, 2010, no 9

Calkins. Code Generation with OpenDDS, Part II OCI Middleware News Brief, 2010, no 7

Calkins. Code Generation with OpenDDS, Part I OCI Middleware News Brief, 2010, no 6

Calkins. OpenMP OCI Middleware News Brief, 2010, no 5

Calkins. Multi-Language CORBA Development with C++ (TAO), Java (JacORB), Perl (opalORB), and C# (IIOP.NET) OCI Middleware News Brief, 2009, no 4

Calkins. Using TAO and OpenDDS with .NET, Part III — DCPSInfoRepo Collocation OCI Middleware News Brief, 2009, no 3

Calkins. Using TAO and OpenDDS with .NET, Part II OCI Middleware News Brief, 2009, no 2

Calkins. Using TAO and OpenDDS with .NET, Part I OCI Middleware News Brief, 2009, no 1

Calkins. Introduction to Direct3D and High Level Shading Language presentation given at an Object Computing, Inc. C++ Lunch, May 29, 2007

Calkins. Threading in Windows NT presentation to Computer Science 338 (Parallel Processing), Williams College, November, 2000

Roman, Hart, Calkins. Visual Presentation of Software Specifications and Designs Washington University Technical Report WUCS-94-08 (August 1994), also appearing in the Proceedings of the 8^th International Workshop on Software Specification and Design, Germany, March 1996

Calkins. Cellular Automata and the Bootstrap Percolation Problem vol. 2, p. 975, Proceedings of the National Conference on Undergraduate Research VI, 1992
[A reproduction of the experiment from ca. 2002]

Calkins, Teresco, Robertson. A Parallel Approach to 3D Cellular Automata vol. 2, p. 1129, Proceedings of the National Conference on Undergraduate Research VI, 1992

Calkins. Macro Photography and Image Stacking Rock Lore, St. Louis Mineral and Gem Society, February 2012, p3-5

Calkins. Stromatolites Rock Lore, St. Louis Mineral and Gem Society, April 2011, p4

Calkins. Photographing Minerals Rock Lore, St. Louis Mineral and Gem Society, March 2011, p4-6

Calkins. Mineral Resources on the Internet Rock Lore, St. Louis Mineral and Gem Society, February 2011, p4

Calkins. Creating Geologic Maps Rock Lore, St. Louis Mineral and Gem Society, April 2010, p14-18

Calkins. Herkimer Rock Lore, St. Louis Mineral and Gem Society, June 2009, p4-5

Calkins. Annabel Lee Mine Rock Lore, St. Louis Mineral and Gem Society, June 2009, p6-7

Calkins. Minerva Mine #1 Rock Lore, St. Louis Mineral and Gem Society, December 2008, p10,12

Calkins. Summertime Collecting Fun Rock Lore, St. Louis Mineral and Gem Society, September 2008, p7