Hmmm, I doudble checked, and I was able to download all three. If you just click on them, and have Adobe Acrobat, they will just pop up into a window. So right click on the link, and "save target as".
http://www.airwarriors.com/data/files/Admin/ASTB%20Gouge.pdf
http://www.airwarriors.com/data/files/Admin/ASTB1.pdf
http://www.airwarriors.com/data/files/Admin/ASTB2.pdf