فقه البيوع على المذهب الأربعة

This is Mf Muhammad Taqi Usmani sahib's buyu' masterpiece, the full title of which is

فقه البيوع على المذاهب الأربعة مع تطبيقاته المعاصرة مقارنا بالقوانين الوضعية.

This is an encyclopaedia of the ahkam of buyu’, covering each type of transaction in detail not found elsewhere. The mu’tamad view of each madhab is presented, often with a study of the fiqh behind it.

The salient characteristic of the book is an exhaustive study of the various contemporary transactions in each chapter, something which has made this book indispensable to anyone studying buyu’ in detail.

Widely-acclaimed and full of unique research, this work is taught in many Dar al-Iftas.
This is the high-quality Beirut edition, which is the best print of the book.

Here are links to two reviews of the book:
https://www.youtube.com/watch?v=lZ_zbQKRIkc

https://www.youtube.com/watch?v=g9RvZ5tqeQc