TY - BOOK ID - 138352314 TI - Crop production levels and fertilizer use. PY - 1981 SN - 9251010994 PB - Roma FAO DB - UniCat KW - Crop yields KW - Fertilizers KW - Economic aspects UR - https://www.unicat.be/uniCat?func=search&query=sysid:138352314 AB - ER -