1
Publicado 1998
“...American Society of Agronomy, USDA-ARS....”
Libro
2
Publicado 1990
“...Crop Science Society of America, Soil Science Society of America with support from the USDA-ARS....”
Procedimiento de la Conferencia
Libro
3
4
Publicado 1994
“...United States Department of Agriculture-Agricultural Research Service (USDA-ARS)....”
Procedimiento de la Conferencia
Libro