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

Enigma – The Journal of The Independent Research Centre for Unexplained Phenomena (IRCUP)

The Independent Research Centre for Unexplained Phenomena (IRCUP) was run by Paul Vigay who also produced their magazine:

Enigma #1 Summer 1993
Enigma #2 Winter 1993 1994