In reply to olddirtydoggy:
Hi olddirtydoggy,
There are no trad specialized guidebook to Corsica but there are a few trad crags that you can find on the guide Falaises de Corse: L’échappatoire near Aiacciu (Ajaccio) Verghellu not so far from Corti and the best one: Punta Bigornu at Col de Bavella.
But if you want to climb trad there are many multi-pitch routes that you can find in the guidebooks
Grandes voies de Corse: https://omegaroc.com/en/multi-pitch-climbing-guidebook-corsica-grandes-voie...
Or Bavella Corsica: https://omegaroc.com/en/multi-pitch-climbing-guidebook-corsica-bavella/
For multi pitch trad, the best places are Ascu Stagnu, Paglia Orba (only on summer because of the elevation) and of course Bavella.