Molnibalage make a small booklet about the S-25 family: Click Here This is the translation of the long Hungarian book what Molnibalage made in cooperation with other guys for ex. with Hpaps, he is well known for the SamSim. This is the whole, in Hungarian: Click here It's a same like the S-300 family booklet (posted in here: S-300 family) Because the chapter is just a part of a big book are some parts in the document which refer to content of the book in other chapters. Slowly the whole book will be translated, book but it could take years to finish it. Have a good reading!