TY  - RPRT
TI  - Tree Swallows: A Nationwide Sentinel Species for Assessing and Monitoring Aquatic Contamination
AU  - Christine Custer
AU  - Thomas Custer
PY  - 2004
DO  - 10.3133/fs20043042
UR  - https://pubs.usgs.gov/publication/fs20043042
ID  - fs20043042
ER  -