TY  - RPRT
TI  - Calibration standards for counting asbestos.
AU  - L W Ortiz
AU  - H J Ettinger
AU  - C I Fairchild
PY  - 1975
DO  - 10.1080/0002889758507217
UR  - https://pubmed.ncbi.nlm.nih.gov/1096583/
ID  - 1096583
ER  -