Back when I first started noticing such things in 1977, Bill Drake's International Cultivator's Handbook was already a classic.
Published in 1974, the book was one of the very first to market that went into detail on how to grow not only marijuana, but also coca and opium.
Source:
http://www.tokeofthetown.com/2011/08/cultivators_handbook_still_around_after_almost_40.php
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