How To Decipher Regional Dialects

What about regional dialects, how do I decipher them?

Each part of the country, particularly the further back you go in time, will have its own dialect forms of words, which quite often were written down the way that they were pronounced, so they would seem very unfamiliar today. And also you'll have obsolete terminology, particularly for things like farm implements, which are no longer current. There are compilations of dialect words that you can tap into and find out what the meanings of these words were.