Authors: Tim Lahaye & Jerry Jenkins
From the series I have the 2nd part, Tribulation force as of Aug 09.
The parts are as follows:
5 - Apollyon
4 - Soul harvest
3 - Nicolae
2 - Tribulation force
1 - Left behind
UPDATE (07.09.09):
At the Lindfield Lifeline, I found 2 more books of the series and I found out there were about 12 in the series so I tried to find out more and I pasted below what I found from the site.
Looks like there are 15 books in the series and the pasted part below is book 15 counting down to book 1.
Currently, I have 3 books from the series:
- Tribulation force
- Desecration
- Glorious appearing
site: http://www.leftbehind.com/01_products/browse.asp?section=LeftBehind
Series Collectors Edition Series
Deceiver's Game
The series that became a phenomenon is now available in a four-volume Collectors Edition. The New York Times and USA Today best-selling series that has sold over 63 million copies will now be available in a four-volume Collectors Edition. With three books in each volume, this is the perfect way to revisit the series that captured your imagination or discover it for the first time. Volume I, Rapture’s Witness, contains Left Behind, Tribulation Force, and Nicolae. Volume II, Deceiver’s Game, contains Soul Harvest, Apollyon, and... 
Rapture's Witness
The series that became a phenomenon is now available in a four-volume Collectors Edition. The New York Times and USA Today best-selling series that has sold over 63 million copies will now be available in a four-volume Collectors Edition. With three books in each volume, this is the perfect way to revisit the series that captured your imagination or discover it for the first time. Volume I, Rapture’s Witness, contains Left Behind, Tribulation Force, and Nicolae. Volume II, Deceiver’s Game, contains Soul Harvest, Apollyon, and... 
Kingdom Come: The Final Victory
The horrors of the Tribulation are over, and Jesus Christ has set up his perfect kingdom on earth. Believers all around the world enjoy a newly perfected relationship with their Lord, and the earth itself is transformed. Yet evil still lurks in the hearts of the unbelieving. As the Millennium draws to a close, the final generation of the unrepentant prepares to mount a new offensive against the Lord Himself--sparking the final and ultimate conflict from which only one side will emerge the eternal...
The Rapture
The final prequel will have the Rapture three-quarters of the way through the book and then following characters such as Irene and Raymie (and others) up to heaven and being able to see events in the Tribulation from heaven's perspective. The book will alternate between focusing on events on earth immediately after the Rapture (covering lots of things the authors wished they could have covered in the original volumes) and focusing on characters in heaven and how they view the chaotic events on earth. Now available in trade...
The Regime
Dynamic Romanian multimillionaire Nicolae Carpathia's sphere of influence steadily grows as he parlays his looks, charm, charisma, and intellectual brilliance into success in business and politics. But is it mere coincidence that those who oppose or offend him suffer to the point of death? Meanwhile, a young Buck Williams begins his journalistic career. Pilot Rayford Steele gains more responsibility at work and at home. Scientist Chaim Rosenzweig begins work on a secret formula that could change the world. All three go about their daily lives, unaware of each other or of the powerful young man from Romania. Around the world,...
The Rising
The Rising begins a new Left Behind series that will give you a glimpse into the lives of your favorite characters before the Rapture. Have you ever wondered what life was like before the Rapture for Rayford, Irene, and Chloe Steele, Bruce Barnes, Buck Williams, and Tsion Ben Judah? Plus, see why Viv Ivins plays such a pivotal role in Nicolae Carpathia's life. What were the events surrounding Nicolae's sudden rise to power? How did he become filled with evil? You will find all these answers and more in this exciting new series!In The Rising,Marilena Carpathia has only one dream:...
Glorious Appearing
Thousands of years of human history stained by strife, death, and sin come to an end when the King of Glory returns to earth. The satisfying conclusion of the seven years of tribulation covered by the Left Behind series portrays the return of Jesus Christ to earth in both glory and judgment at the height of the battle between the forces of evil gathered at Armageddon and the remaining Christian believers at Petra and Jerusalem. Nothing seems to be able to stop the Antichrist, Nicolae Carpathia. But God is in control. Street date: Tuesday, November 16,...
Armageddon
The scattered Tribulation Force is drawn inexorably toward the Middle East, as are all the armies of the world, when human history culminates in the battle of the ages. During the last year of the Great Tribulation, safe houses are no longer safe, and the cast of characters dramatically changes. By the time of the war of the great day of God the Almighty, the globe has become a powder keg of danger. Except those already in Petra, everyone has been forced to relocate as Antichrist ratchets up the pressure in the world's most treacherous game. Who will be left...
The Remnant
The incredible tenth book in the international best-selling Left Behind series is now available in paperback. The Great Tribulation unfolds as the forces of evil and the armies of God prepare for mankind's ultimate battle. Millions of Christians are protected by God as the anger of the Antichrist, Nicolae Carpathia, burns against them. Over 2.5 million copies sold in...
Desecration
The exciting ninth book in the Left Behind series that has sold over 2.5 million copies in hardcover is now available in trade paperback. In November 2001 Desecration was #1 on the New York Times, USA Today, Wall Street Journal, Publishers Weekly, and CBA Marketplace best-seller lists. With 50 million products sold, the Left Behind series is an international... 
The Mark
The exciting eighth book in the Left Behind series has sold over 2.5 million copies in hardcover and is now available in trade paperback. With over 40 million products sold, the Left Behind series is an international...
The Indwelling
Nicolae Carpathia is dead. But who killed the Antichrist? The answer may surprise you. Book seven in the best-selling Left Behind series marks the beginning of the second half of the seven-year Tribulation period. In dramatic fashion, readers are exposed to the horrors of God's judgment and the hope of salvation. Rayford, Buck, Chloe, and the rest of the Tribulation Force find themselves at the center of heart-stopping action. Number one on the New York Times Best Sellers List for four... 
Assassins
After selling nearly two million copies since its release in August 1999, Assassins in now availabe in trade paper! The seven-year Tribulation reaches its halfway mark in the sixth book of the blockbuster Left Behind series, Assassins. Nicolae Carpathia is assassinated, setting the stage for the Great... 
Apollyon
The #1 best-selling hardcover novel of 1999 is now available in softcover! The Tribulation Force travels to Israel for the Meeting of Witnesses as further judgments are released upon the world. Satan falls from heaven and opens the bottomless pit, releasing Apollyon and his plague of locusts that torture the unsaved. Now available in trade softcover, Apollyon is a thriller that will be tough to put... 
Soul Harvest
The fourth book in the popular Left Behind series from Tim LaHaye and Jerry B. Jenkins is now available in trade softcover. In Soul Harvest the world is reeling from a great earthquake. As Nicolae Carpathia begins a worldwide rebuilding campaign, his rage is fueled by an evangelistic effort resulting in the greatest harvest of souls the world has ever seen. Meanwhile, Rayford Steele and Buck Williams search for their loved ones who haven't been seen since before the...
Nicolae
It has been nearly two years since the day of the mass disappearances. In one cataclysmic instant, millions all over the globe simply vanished, leaving everything but flesh and bone behind. Nicolae begins as global war has erupted. The Red Horse of the Apocalypse is on the rampage, and the Tribulation Force sets a suicidal course that places them in direct opposition to the rise of...
Tribulation Force
Rayford Steele and Cameron ("Buck") Williams find themselves pressed into service for the man they believe could be the Antichrist. Nicolae Carpathia takes over the United Nations, signs a peace treaty with Israel, and begins to lure the nations of earth together to form one global village. Meanwhile, the judgment of God begins to fall on the earth. Buck and Rayford, along with their pastor and Rayford's daughter, must fight to stay alive and battle the forces of evil in the strength of their fledgling, newfound...
Left Behind
When the trumpet sounds, where will you be? Passengers in an airborne Boeing 747 find out in this riveting novel by renowned Christian speaker Tim LaHaye and master storyteller Jerry Jenkins. Without any warning, passengers mysteriously disappear from their seats. Terror and chaos slowly spread not only through the plane but also worldwide as unusual events continue to unfold. For those who have been left behind, the apocalypse has just begun. This fictional account of life after the Rapture delivers an urgent call to today's readers to prepare their own hearts and minister to...
