TY  - JOUR 
T1  - Background levels of some trace elements in weathered soils from the Brazilian Northern region
JO  - Scientia Agricola
A1  - Fadigas, Francisco Souza
A1  - Amaral Sobrinho, Nelson Moura Brasil do
A1  - Anjos, Lucia Helena Cunha dos
A1  - Mazur, Nelson
SN  - 0103-9016
UL  - 10.1590/S0103-90162010000100008
VL  - 67 
Y1  - 2010
PB  - Brasil 
ER  -