The Sign Historical Group (SHG) is an association of scholars, researchers, and others who have come together to facilitate and promote the discovery and preservation of materials, and the production and dissemination of publications, about the history of the UFO phenomena and the institutions and persons who investigate it.
On of SHG's major projects is the creation of the Comprehensive UFO Resource Center (CURC), with an individual pages for each of the thousands people, organizations, periodicals, books, articles, sightings , and other things related to UFOs. In addition the CURC is in the process of providing immediate access to all possible written materials, within copyright regulations.