It's one of Pat Stansell's company, Military Miniatures in Review (MMiR). He used to print the magazine in quarterly issues, but there were rarely four issues in a two year period. A one year subscription (4 issues) might take 2-3 years to be fulfilled.
I believe, this book is comprised of Tiger based articles from the quarterly issues of MMiR collected into one volume.
Talking about that magazine here used to be verboten because it was a top competitor back in the day. Old MMiR magazine issues are still worth some money based on the issue and model kits covered.
The old MMiR Modeler's Guide to the Sherman tank was one of the "Holy Trinity" of Sherman tank references along with the Hunnicutt book and the George Forty book. Fifteen years ago, the MMiR Sherman book was selling for over $100, sometimes just under $200.
The Son of Sherman was released fairly recently and folks are still receiving the initial printing right now.
Here is a 10 year old thread from Missing Lynx about the MMiR Tiger book. It has some information and discussion about why the book isn't as popular as the Sherman one was/is.
https://www.tapatalk.com/groups/missinglynx/references-on-tiger-i-t52475.html