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Subtle Energy
An article in a web-based magazine by Paul von Ward Lightworks. Deals with Cleve Backster's mind-plant discoveries and the author's speculations about them.
Plant Articles by Judith Handelsman
A series of articles from various magazines. The second one has relevance primary perception discoveries, as it describes Handelsman's own experiences with the phenomenon.
Happy Plants
Deals with Cleve Backster's experiments and other mind/plant experiments, including ones backing up Backster.
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