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@Jonesey95: thanks for the sandbox version, that achieves what I hope for, for referring to the supplements. Regarding the |ref=harv can the same switch be used to set a separate {{harvid}} for each of the five options to go into the |ref parameter? Nthep (talk) 18:42, 8 December 2016 (UTC)[reply]
Yes. Give it a try. I'll help if you need it. – Jonesey95 (talk) 02:17, 9 December 2016 (UTC)[reply]
I'll have a look over the next few days (RL intervening :-( ) Nthep (talk) 10:14, 9 December 2016 (UTC)[reply]