Bible Class Book On The Minor Prophets, by David Padfield. A 53 page survey of the 12 Minor Prophets. This free Bible class book has questions for each section (PDF file size: 350k).
Prophecy and the Prophets, by Gene Taylor. This a 26 lesson study which examines the prophetic office, those who filled it, and its role among God's people. It includes introductory surveys on all the books of both the major and minor prophets along with lessons on the non-writing prophets and prophecy in the New Testament (PDF file size 744k).
Between The Testaments, by Gene Taylor. This is 12 lesson study of the 400 year period of Biblical silence between the testaments and the world empires which impacted it and the events in Scripture (PDF file size 447k).