Where to find historical books/accounts/doents on Austro-Hungarian parts of Ukraine in the 19th century?

I am writing a research paper trying to explore the roots of modern east-west division in Ukraine. I know that religion and a type of politicized religious preaching played part in this so I need to find sources both for Russian dominated Eastern Ukraine and Western Ukraine which in 19th century belonged to Austria-Hungary and has strong WEuropean influences.