Looks like you already have alot of good information to get you started on your search.
Since your dad was in and out of hospitals for over a year, the VA is definitely the first place I'd check for records.They should have an extensive file on your dad.
One book I'd suggest for a good general history of the war in Europe and for info regarding the combat experience of the ordinary footsoldier is "Citizen Soldier" by Stephen Ambrose.It was a best seller so it is easy to find at a local library or from the usual booksellers."Citizen Soldiers" is an easy book to get though, especially for those folks who don't know alot of military history.
Do a "google" search for the "80th Infantry Division".You'll come up with alot of sites, including a reunion association.
A brief bit of WW2 history to kinda explain where your Dad was when he was wounded: As you know, we landed in Europe on D-day, June 6, 1944.American troops fought their way across France during the summer and fall of 1944.In December 1944 the Germans counter-attacked in the famous "Battle of the Bulge."Our troops stopped them, and then began to prepare for the final push into Germany.Our troops were poised along the German border in Luxembourg and France.They faced the German "West Wall" defenses, a series of concrete emplacements, pill boxes, tank traps, trenches etc. designed to protect the border of Germany. This was a very tough area to get through.(here's where a good atlas of Europe will come in handy)In early February 1945 the 80th Division attacked and broke through these West Wall positions along the border between Luxembourg and Germany.On February 18th 2 regiments the Division attacked from their positions along the Our River toward the town of Mettendorf.The 319th Regiment, of which your dad was a member, did not participate in this attack, but rather remained behind to mop up the remaining German forces left behind after the breakthrough. By Feb 21 the 319th IR had elimated these positions, and captured the town of Roth.This is only a few miles inside Germany along the Luxembourg border.If you do a web search for a map it is just a couple of miles west of Mettendorf.