01-01-1974 This book includes 460 species of trees- includes each plant family begins with a family description and a key to all of its species. Also included are briefdescribtions of 40 minor species.
01-01-1987 A portable dictionary of the vascular plants utilizing Kubitzki's "The families and genera of vascular plants" (1990-), Cronquist's An integrated system of classification of flowering plants (1981), and current botanical literature. 858 pages
01-01-2001 The SIM Forestry study Project began in 1999 to bring together various sources of information about highland Ethiopian trees and shrubs, and to identify trees and shrubs that should be further propagated.