John Hughes has some worthwhile articles on his site:
Endurance Cycling
Training for Brevets Part 1: Base endurance training.
Training for Brevets Part 2: Building power and peaking.
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Preparation for Randonnees
UltraMarathon Cycling Association has lots of useful articles listed on their site:
Audax
Audax is a cycling sport in which participants attempt to cycle long distances within a pre-defined time limit. Audax is a non-competitive sport: success in an event is measured by its completion. Audax has its origins in Italian endurance sports of the late nineteenth century, and the rules were formalised in France in the early twentieth…
DIY Routesheet Holder
A simple, cheap routesheet holder
Audax Club Parisien
BRMs are conducted under the auspices of the Audax Club Parisien
PBP USA Wiki
The PBP USA Wiki was created as a place to share information relevant to US riders going to PBP, wikipedia-style. No doubt much of the information may be useful for residents of other countries. Access the PBP USA Wiki here.
LEL | Randonneuring | Rides
LEL 2017 Finishers
The official list of finishers: http://www.aukweb.net/results/archive/2017/listevent/?Ride=17-1