J. Talbot, 'What is Icenian coinage?', DPhil thesis, University of Oxford (2015), 2 vols, open access. Vol. 1: section 3.6.3 and Table 3.18 (pp. 101-104: Ece B die-groups; die-group 1 366 coins, 5 obverse and 14 reverse dies), inscriptions (pp. 195-196), Table 6.21 (p. 250: Mint C, Aesv/Saenv and Ece B in phase 4, AD 20–AD 43/60); vol. 2: section III.44 'Saenv, Aesv and Ece B Units' (pp. 202-206: 'About halfway through die-group 1, four dies have the shoulder pellets replaced by a trefoil of elongated pellets'; Table III.45 weights), section III.51 (p. 220: trefoil on 'Ece B dies 6–9'), Appendix IV metal analyses (pp. 222-223: six Ece B units), Appendix XI concordance (p. 273: 'Ece B U 1663, 1666, 1669; VA 762, 764, 766; BMC 4431-9'), Appendix XIII (p. 282: Ece B 579 official coins, 8 obverse and 21 reverse dies) link
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