Global estimates of gaseous emissions of NH3, NO and N2O from agricultural land /por FAO - Rome : FAO, 2001 - 106 p. : gráfs. ; mapas ; tablas ISBN: 9251046891 LCCN: 87479 Subjects--Topical Terms: Ecología agrícola.Fertilizantes. Dewey Class. No.: 631.8 / F62