So what do these books teach us?

[Pathfinder Dada]

Looking through some old notes I had discovered the following titled books in a scenario, "Practical Thaumaturgy In Accordance with Creation,  Geographic Anomalies of the Inner Sea, Under Kaer Maga: A Trial and Travel, Physiology of Dragons: An Illustrated Reference, Lost Sarusan". Anyone know if these titles have worked there way into the game rules at all? If not, what do you think they might behold to the reader?
I believe they were discovered in the "Service to Lore" intro scenario so long ago.

[Nefreet]

I believe these, along with the vast majority of in-game texts, are meant to be left to the players'imaginations.

[JDLPF]

Usually they mean a +2 circumstance bonus to a Knowledge check about a specific subject.

[Niemand]

I didn't learnt nuthin

8^)

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They can be a Pathfinder Chronicle or Masterwork Tool for a specific knowledge check granting +2 circumstance bonus after review(rounds). 50gp