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The Crop Circle Research Archive is home to one of the world’s largest databases of crop circle-related information.

The Probe Report (NUFOR Southwest)

The Probe Report was the official publication of the southwest branch of the National UFO Research (NUFOR). The magazine published photographs of crop circles from as early as 1980:

The Probe Report Vol 1 #2 Aug-1980
The Probe Report Vol 1 #2 Aug-1980
The Probe Report Vol 1 #3 Dec-1980
The Probe Report Vol 2 #3 Dec-1981
The Probe Report Vol 2 #4 Mar-1982
The Probe Report Vol 3 #2 Oct-1982
The Probe Report Vol 3 #4 Apr-1983
The Probe Report Vol 4 #2 Oct-1983
The Probe Report Vol 1 #2 Aug-1980
The Probe Report Vol 1 #2 Aug-1980