If you have seen the show Project Blue Book and feel you are ready to start digging deeper into the cases, there is an online source for original document scans. It's a huge archive of nearly 11,000 pages that spans the years 1945-1969.
The pages are clearly labeled so you can search for a particular case of interest. We took a quick look at what's available and have found some mentions of Roswell in the files. Since the official dates of Project Blue Book are 1952-1970, many of the pages are related to the earlier studies that were conducted including Project Sign (1947) and Project Grudge (1949).
Be sure to set aside enough time to give them a look, and when you are ready start researching click here.