TY  - RPRT
TI  - Description and identification of American Black Duck, Mallard, and hybrid wing plumage
AU  - Ronald E. Kirby
AU  - Austin Reed
AU  - Pierre Dupuis
AU  - Holliday H. Obrecht
AU  - Walter J. Quist
PY  - 2000
UR  - https://pubs.usgs.gov/publication/bsr20000002
ID  - bsr20000002
ER  -