TY  - GEN
AU  - Anderson,D.R.,Henny,C.J.
TI  - Population ecology of the mallard 1 A review of review of previous studies and the distribution and migration from breeding areas
PY  - 1972///
CY  - Washington
PB  - United States Department of the Interior Fish and Wildlife Service
KW  - Population Ecology
KW  - Mallard
ER  -