Campyonly.com is a big Campag reference site, including timeline, catalogues, and Ergo rebuild instructions:
and Andrew Muzi at Yellow Jersey has Ergo rebuild instructions here:
Branford Bike has a big Campag reference section. They've reorganized their site since I was last there, but it's all still here in the "knowledge base" section:
and there are many Campag parts catalogues here:
Calmes dans le demi-jour
Que les branches hautes font,
Pénétrons bien notre amour
De ce silence profond.