@lesswhitmore,
Quote:"They also contain the collected works and history of a slave race previous to their existence, the race has been titled "Man."
The referents of "They," "their," and "race entitled 'Man' " aren't clear. For instance Whit, with our first interpretation "They" refers to certain books; but then "previous to their existence" throws us for a loop. So try this:
"They also contain the collected works and history of a slave race previous to
its existence….," meaning that of an earlier "slave race". Apparently the writer posits our demise, perhaps by a nuclear war, and the evolution of one entirely new to take its place, who in excavation of a building, for instance, unearth that set of historical tomes
You must understand however, that the sentence is open to 34 other interpretations (by actual count) depending entirely upon context. Once having established who where is doing exactly what, we can punctuate. Meantime here's my own contribution
Digging was called to a halt when found to contain bookcases suggesting a school or library. As Famir Gruppo reports, "They also contain the collected works and history of a slave race previous to
its existence, which we now refer to as 'Man.' "
If you review this carefully, Whit, you will see another very close interpretation is possible involving not two but three possible civilizations though please don't ask me to analyze any possible simultaneity