Real World article
(written from a Production point of view)

Kea Four was the fourth planet in its star system. There was an archaeological excavation on this planet.

In 2368, Captain Jean-Luc Picard was a speaker at an archaeological symposium. He wrote a paper about the Kea Four excavation, which he read to an audience at the symposium. (TNG: "The Chase")

A section of dialogue was cut from the episode in which Jean-Luc Picard and Richard Galen were talking about the symposium. [1]