TY  - RPRT
TI  - Determination of readily soluble copper, zinc, and lead in soils and rocks; nitric acid extraction
AU  - Harold Bloom
AU  - H.E. Crowe
PY  - 1954
DO  - 10.3133/ofr53287
UR  - https://pubs.usgs.gov/publication/ofr53287
ID  - ofr53287
ER  -