Technical Bulletin : Agricultural Research Service - Depart. of Agricultura. Agricultural Research Service (Washington Depart. of Agricultura. Agricultural Research Service, 1984)
BPH: Techn.Bull. U.S.D.A. Existencias: 1984 no. 1691; 1988 no. 1719; 1990 no. 1755, 1757; 1992 no. 1791, 1796; 2003 no.1890 parte 1 y 2
Keywords: Agricultura