This page has a lot on it. You can use the following anchors (links down the page) to jump straight to a relevant box.
University College Dublin has an excellent online guide to different periods and styles of Irish maps. I encourage you to check out their guide for additional suggestions.
In our very own special collections library (Burns), you'll find an impressive array of material on Irish History. It's one of BC's areas of focus. If you're studying the topic it's well worth the trip to hold that history in your hands.
To do so, you should start by searching for material through BC Libraries' catalog and then ordering it (if you haven't registered, you'll be prompted). For a guide on the process, check out the "Finding Burns Material" page.