The Single Series of Mushroom Model Publications focus on a specific airframe, sometimes even down to a specific mod or variant of an airframe, as in this case.
The booklet includes line drawings of the PZL TS-11 in both 72nd and 48th scale, some drawings (probably from some technical manual) with details on the wings and airbrakes, plus a nice walkaround -in black and white) of the airplane. There are a few color pictures showing the cockpit and electronics, plus a 4-view very attractive color profile.
I’m glad the booklet includes color pictures of the cockpit and electronic bays, as those colors are the hard-to-research. External colors are easier to research and even depend on the specific airframe you are modeling.
You can see a short video of every page in the book at https://www.youtube.com/watch?v=dk6XcJpUJxY