Description:
This site outlines the history of, research on, and questions about cocoa production systems in Costa Rica and Panama.

Accessible from:
http://nationalzoo.si.edu/ConservationAndScience/MigratoryBirds/Research/Cacao/somarriba.cfm

Description:
This article discusses the hypothesis that while cocoa production has for centuries contributed to deforestation, it may change in the 21st century.

Accessible from:
http://natzoo.si.edu/smbc/Research/Cacao/ruf.htm

Description:
This site contains an article about a serious coffee disease called Kona wilt that is caused by a nematode.

Accessible from:
http://www.kpfc.com/news/detail.asp?NEWS_ID=6

Description:
This paper compares shade and sun coffee generally and in relation to erosion, nitrogen cycling, stress and competition, biodiversity, yield, diseases and pests, and uses.

Accessible from:
http://216.224.52.200/honeybear/shade.htm