Aerial Phenomena Research Group (APRG-US)

The Aerial Phenomena Research Group (APRG) was a Washington-based ufology organisation, established in the mid-1950s by Robert Gribble, who went on to direct the National Investigations Committee on Aerial Phenomena (NICAP), and founded the National UFO Reporting Center (NUFORC) in 1974. The group published a periodical entitled the APRG Reporter beginning in 1957.