I would suggest that you go back to their website and look around for a Contact Us page and call or write to them and explain to them about your project and ask them directly for permission to view those pages, and I m sure they ll be happy to let you see them.Good luck!
You can try this site. It does not have any history of the union but it is FULL of men who do nothing but talk about the job. You can get a whole lot of information just by reading the threads. www.subchat.com
Join the union!