Yorkshire Advice V

"Read The Book".
This is a sign in a field in Oxenhope for the 2014 Tour de France which will pass through here.
It is part of a series - this is number 5 (but I don't know how many the series will consist of).
No. 1
No. 2
No. 3
No. 4

I have to admit I don't 'get' this one - what book and why should I read it?
Any help/ideas will be most welcome.

Late breaking news here!