Matching ruminant production systems with available resources in the tropics and sub - tropics . Wageningen , The Netherlands , Technical Centre for Agricultural and Rural Cooperation ; Penambul Books , Armidale , A.C.T. 245 p .

The concentration of macro - elements in economic products and residues of ( sub ) tropical field Crops . ... T.R. and R.A. Leng 1987 Matching ruminant production systems with available resources in the tropics and sub - tropics .