Only "Some" books have a solution book, and not in all editions, our priority is to publish the solution book together with the book in its respective edition
so that the problems of the book are in accordance with the exercises solved in the solution book.
If you only find the book in one publication it is because we do not have the solution for that Edition; or maybe it does not exist, but you should also look in another edition.
To do so, just click on the name of the author of the book and you will be able to see all the editions we have of it.
Tip: In certain books, mainly science, physics and chemistry, the solution book of one edition can be used for other editions,
since many of the problems it contains are the same from one edition of the book to another, or are simply in a different order.