It doesn't matter what kind of nouns they are. Linkage by and means the plural should be used. The exception is when the two taken together are normally considered a unit.
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So do you mean that the two sentences I wrote on my previous messages should both in pluralYes. That's right.
AnonymousHmmm....I would say, "There was follow-up discussion and correspondence after the meeting," (This is the BrE way.)
"There were follow-up discussion and correspondence after the meeting" definitely doesn't sound right to me. (AmE allows both 'was' and 'were'.)