Those "Thunderbird Illustrated" Magazines..
That magazine was put out a good number of years ago and is no longer available. However, I was able to obtain a set of them and spent a lot of time and effort into compiling them and putting them into the Technical Resource Library. You can find them by clicking on the link to the TRL which is always part of my signature element. Either use the Find option and type in Thunderbird Illustrated and that will take you right to the link. Or just scroll down until you find the link.