This is not to belittle this work.
It covers all of the obvious german allies, Slovakia, Hungary, Romania, Finland, Italy and Bulgaria - and then adds in Croatia and Russia.
Given the Osprey Vanguard format the text is necessarily brief, but I still found myself noting detail that I was unaware of (I have been intrigued by this area of study since acquiring Mr Z's work, co-authored with James Grandsen, The Eastern Front, back in the 1980s). Once I did raise my eyebrows in mild disagreement, but with a few seconds reflection I realised that Mr Z, as usual, is perfectly correct, and I was being a rivet counter! What the volume does do is to draw the threads of the different nations together.
Many of the photographs are old hat, but then there is a distinctly limited source body, and there are a number previously unknown to me, notably a TACAM T60 apparently in field service - most photos I have seen are of empty vehicles, or parading through, presumably, Bucharest.
I certainly commend this book to any new student, and for any mature student, given the modest price I still say "if you ain't got it, you ain't serious".