TY  - RPRT
TI  - Marked DDE impairment of mallard reproduction in controlled studies
AU  - R.G. Heath
AU  - J. W. Spann
AU  - J.F. Kreitzer
PY  - 1969
DO  - 10.1038/224047a0
UR  - https://pubs.usgs.gov/publication/5221264
ID  - 5221264
ER  -