Deadliest School Shootings in the U.S. (Google Earth project)

I have created another Google Earth project, with this one focusing on the locations of school shootings in the United States where at least 4 people were killed, not including any perpetrators. This one has some overlap with my [You must be registered and logged in to see this link.], but there are also a bunch of new locations in this project. If you notice any mistakes in the project, feel free to point them out.