TY  - RPRT
TI  - A recommended method for soiling index surveys by automatic filter paper sampler.
AU  - C E SCHUMANN
AU  - C W GRUBER
PY  - 1960
DO  - 10.1080/00022470.1960.10467954
UR  - https://pubmed.ncbi.nlm.nih.gov/13748970/
ID  - 13748970
ER  -