TY - BOOK ID - 82299599 TI - Soil degradation : a threat to developing-country food security by 2020 ? PY - 1999 SN - 0896296318 PB - Washington International food policy research institute DB - UniCat UR - https://www.unicat.be/uniCat?func=search&query=sysid:82299599 AB - ER -