Ray- The link is good and the file is okay.
This is the 1984 edition of the Defense Intelligence Agency Small Caliber Ammunition Identification Guide, Volume 1, small arms cartridges up to 15mm.
The problem is that it is a 10.11 MB file of a 323 page document with lots of images in .pdf format. It just takes a very long time to load. Figure about 15-20 minutes with a DSL connection, or a week or so on a dial up connection.
I suspect your lock up came if you tried to move around on the document before it was all downloaded, and if you dont have a lot of RAM memory, your computer just got hopelessly lost among all the stuff being downloaded.