TY  - RPRT
TI  - Black duck harvest and population dynamics in eastern Canada and the Atlantic Flyway
AU  - R. K. Martinson
AU  - A. D. Geis
AU  - R.I. Smith
PY  - 1969
UR  - https://pubs.usgs.gov/publication/5210049
ID  - 5210049
ER  -