Understanding St. Thomas in Context

I have been studying St. Thomas for a couple of months now and I found a great tool for studying the Latin text of the Summa Theologiae. It is the Lexicon of St. Thomas. If you are serious about understanding the Latin words and the proper context they are used in the Summa, then you will love this book. It has every word contained in the Summa and the location and context of each word. I was able to purchase the complete Summa in Latin on Ebay for about $30.00, and somehow I found a complete English text for about $10.00, and this lexicon is about $70.00 (50.00 on sale now at PCP). So for a little over a $100.00 bucks I was able to put together a nice set to study the Summa. The Lexicon was originally published in 1948, and PCP once again has reprinted a classic. The lexicion is over 1200 pages and gives you a working definition of the word you are looking for in the Summa to help you really understand what the Angelic Doctor's intention was in the text.