If you have browsed nonfiction, you may have noticed that at the end of general knowledge (Dewey Decimal 001) and right before books about books (002) there are some titles on unusual topics. You might encounter Atlantis, Area 51, bigfoot, the Loch Ness Monster, and other subjects worthy of The X-Files, opens a new window under the call number 001.9. This is the unexplained, the uncategorized, or what OCLC refers to as "controversial knowledge”, opens a new window. Are these subjects based in reality, or do they belong to the realm of folklore? Come investigate for yourself. Below is a selection of the the books that fall under 001.9 at St. Tammany Parish Library.