God raises up a number of prophets to send warnings to the Israelites and call them back to repentance and to Him. They share the coming judgement of God but also the amazing news of redemption and restoration! The minor prophets played a major role in the history of Israel, even pointing out the coming of the King.
In this painting, a man is crying out (center of painting) to the people of Israel and Judah (map). The unifying theme of these books is a pattern of repentance and relapse, judgement and justice.
Each of the 12 Minor Prophets are represented by the small rectangles that touch that center image. Therefore this one painting depicts books 28 through 39.