How many minor prophets books in the Old Testament?

The difference between a "major prophet" and a "minor prophet" is their scope, not their significance. The "minor prophets" in the Bible see only the events that are coming to the "specific nation" they are assigned to. The "major prophets" see events coming upon not only their nation "but the nations of the world---world events.

http://www.faithwriters.com/article-details.php?id=35862

Zehaniah, a 'minor' prophet says in 3:8 "Therefore wait for Me," declares the LORD, "For the day when I rise up as a witness. Indeed, My decision is to gather nations, To assemble kingdoms, To pour out on them My indignation, All My burning anger; For all the earth will be devoured By the fire of My zeal.

Seems to me he is addressing 'the nations f the world' but is a 'minor' prophets.

**The initial difference written above is inaccurate, because how do you explain Joel's prophecy about the Holyghost in Joel 2:28, 29? And Joel is considered a minor prophet. So I will stick with the difference being in the length of their prophecies.