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Paris - Brest - Paris:
Histoire d'un course décennale 1891-1951 [Link to source]
[oops - now (2010) the source is subscriber only]
par Michel DARGENTON

The first 3 chapters of this book, covering the first 3 PBPs, are reproduced in this online version of Dargenton's book.
The text is in French. There are time result lists and lots of photos.
(It's on the "Mémoire du cyclisme" website.)

The Photos from chapters 1-3 can be browsed in the photos section of this site:
1891, 1901, 1911