TY  - RPRT
TI  - Effect of sewage sludge on nutrient and toxic metal content of soil and selected crops grown on tropical soils
AU  - Nancy Cavallaro
AU  - Jose A. Villarrubia
PY  - 1989
DO  - 10.3133/25213
UR  - https://pubs.usgs.gov/publication/25213
ID  - 25213
ER  -