Organic didn’t start with the Hippy movement of the 60s. The intellectual foundation of natural, regenerative, sustainable, chemical-free farming goes way back.
If you want to learn more, this link will connect you to a YouSendIt download page for an Acrobat Adobe slide show presentation titled, Historical Development of Organic Agriculture.
It contains some great old images and texts from before the chemical (de)revolution.
The author of the presentation is Dr. Joel Gruver, School of Agriculture, Western Illinois University. He developed it for his Intro to Sustainable Ag class.
[NOTE: the YouSendIt link will only be live for a week.]