How to deal with Publication dates of Works?

Hi!
On IMSLP there are sometimes publication dates for works, but on MB there is no such relation for works. Should I put it as composition date? IMO, this wouldn’t apply to collections like http://imslp.org/wiki/Tafelmusik_(Telemann%2C_Georg_Philipp) , what should I do?
Dorian

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There is a ‘Publisher’ relationship, but in the case I have I don’t know the publisher, I just know the publication date and city, and it is not an isolated case for older stuff.

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Do they really mean publication or do they actually mean first performance?
It’s strange to know the city / not know the publisher.
It seems easier to know a publisher than a city to me.

Oh sorry I found the publisher, it’s the composer. I will come back if i find an actual problematic case. Sorry for disturbing.

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