Originally published in 1926; each chapter averages about 16 pages; even though the author does reference liberal scholars at times, this commentary on the latter, small books of the Old Testament of the Bible comes from a generally conservative viewpoint and is quite helpful and enlightening (and don't skip the appendix section at the back of the book as there is some good info there too).
While this book is nearly 100 years old, the scholarship of this book is very good. The author summarizes each of the twelve minor prophets and deals with objections of authenticity in the appendix of the book. Although there are more modern books on the minor prophets the contents of this older book is still useful.
The first part of the book does an excellent commentary of the 12 prophets. However he writes an extensive appendix that tries to prove that the 12 books were changed throughout history. He even attemp rd to prove that the prophets did not actual write the books that bare there names.