TY  - RPRT
TI  - Chapter A7 Biological Indicators
AU  - Donna N. Myers
AU  - Franceska D. Wilde
PY  - 2008
DO  - 10.3133/twri09a7
UR  - https://pubs.usgs.gov/publication/twri09A7
ID  - twri09A7
ER  -