1. 关键资源 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. 2003-02-01 Tropical Trees: Propagation and Planting Manuals, volume 2.
  3. 2003-02-01 This Manual is the second in a series of readable, well illustrated handbooks about propagating and planting tropical trees.The five Manuals have been designed to provide clear and concise information on how to select, grow, plant and care for tropical trees, in both moist and drier parts of the...