Book excerpt: For years, serious researchers have known that triangular-shaped UFOs are one of the most common types observed. The phenomenon has sparked intense debate among many and excited the imagination of many others. But until now, there has never been a book-length treatment of this fascinating subject.Finally, we have one. David Marler has provided a comprehensive analysis of "the triangles." He has collected, collated, and analyzed hundreds of reports. In the process, he has created a detailed profile of these objects and written a rich narrative of their history.Marler is well-suited to the task, having at his disposal an enormous collection of newspaper archives, declassified military reports, UFO books and journals, and the transcripts of many first-hand interviews he has conducted. He has also received input from many prominent individuals from within the military, FAA, Aerospace, and UFO research field.He tackles the arguments made by skeptics that dismiss these triangular UFO reports outright. He also address the claims of so-called insiders who claim these objects are a creation of the U.S. military.The results of his years of research are documented in his book, Triangular UFOs: An Estimate of the Situation. It is a book that has long been needed, not only by the UFO research community, but the general public, as it opens up an entirely new discussion that has long been ignored: who is making the triangles?