Q: Dating of "Columbia" = America

[Joel S. Berson]

What is known about the earliest use of "Columbia" to refer to America?

I presume a Google search would be pointless (unless someone can
suggest a really refined search condition!), and I don't know where
else to look.  The OED omits "Columbia", I assume because it's a
place name, and has "Columbian" adj. from 1757.

Joel

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