TY  - RPRT
TI  - Using natural archives to track sources and long-term trends of pollution: some final thoughts and suggestions for future directions
AU  - Jules M. Blais
AU  - Michael R. Rosen
AU  - John P. Smol
PY  - 2015
DO  - 10.1007/978-94-017-9541-8_17
UR  - https://pubs.usgs.gov/publication/70145310
ID  - 70145310
ER  -