TY  - RPRT
TI  - Local variation in background water quality.
AU  - B W Webb
AU  - D E Walling
PY  - 1974
DO  - 10.1016/0048-9697(74)90024-2
UR  - https://pubmed.ncbi.nlm.nih.gov/4439007/
ID  - 4439007
ER  -