Long-baseline horizontal radio-frequency transmission through polar ice. Issue 12 (1st December 2020) - Allison, P.; Archambault, S.; Beatty, J.J.; Besson, D.Z.; Chen, C.C.; Chen, C.H.; Chen, P.; Christenson, A.; Clark, B.A.; Clay, W.; Connolly, A.; Cremonesi, L.; et al.