Crop circles are patterns created by the flattening of crops, generally barley, canola, corn, linseed, rye, soy, or wheat. Amid speculation that they are the work of extraterrestrial beings, many have been demonstrated to be hoaxes but the origins of others remain unknown.
Regular Websites
Available in several languages, the CCC presents an overview of crop circles, answers common questions on the subject, and includes a gallery of photographs of documented crop circles from around the world, a guide to researchers, conferences, and organizations, as well as books, magazines, and other products. - Crop Circle Connector
http://www.cropcircleconnector.com/
Focuses on scientific investigations and research projects into the unexplained phenomena known as crop circles. Included here is a database of documented crop circles, research facts, articles, books, and other resources. - Crop Circle Research
http://www.cropcircleresearch.com/
CCS is a crop circle research organization seeking to help the public make an informed decision on the origin of crop circles. A book, published by Crop Circle Secrets, is available online, along with DVDs and a schedule of lectures on the subject. - Crop Circle Secrets
http://www.cropcirclesecrets.org/