With articles by Sewell, Duinker, Stroud, Brody, Reuven, Horton; articles from the SMT 2019 Plenary session by Marvin, Ewell, Everett, Straus, and Hisama; and reviews by Farbood and Fulkerson.

With articles by Karpinski, Chenette, Gates, Marvin, Schumann, Boyle, Smith, Shupe, Donaldson, Hahn, Kozak; reviews by Duguay and Kovaciny.

With articles by Smith, Yunek, Wadsworth, Needle, Ng, Yust, Burns, Wiskus, Sullivan, Schumann; reviews by Trevor, Reybrouck, and Shanahan.