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  1. Key Resource 2007-01-01 By Dr. F. W. Martin. Published in parts, 1989 and 1994; Revised 1998 and 2007 by ECHO Staff Though nearly all plants are useful in some way, they are not equally valuable. For example, wheat, rice and corn may be considered the most valuable plants in the world based on the vast acreage planted...  
  2. Key Resource 1998-05-01 A wide variety of fruits is grown in the tropics, under a range of climatic conditions and soil types. Some have been widely used both within the tropics and also exported to temperate countries for many years, whereas others are currently grown almost exclusively for local or regional use....  

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