There are two main types of coffee beans, robusta and arabica.
Robusta:
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Arabica:
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Click here to find out more about Robusta versus Arabica coffee:
http://scholarsresearchlibrary.com/DPL-vol3-iss1/DPL-2011-3-1-292-297.pdf
http://scholarsresearchlibrary.com/DPL-vol3-iss1/DPL-2011-3-1-292-297.pdf