000			00602 a2200145 4500
080			_a636.597:591.554 _bA 23 P
245	1		_aPopulation ecology of the mallard 1 A review of review of previous studies and the distribution and migration from breeding areas _cby D.R. Anderson and C.J. Henny
260			_aWashington _bUnited States Department of the Interior Fish and Wildlife Service _c1972
650			_aPopulation Ecology
650			_aMallard
100	1		_aAnderson, D.R., Henny, C.J.
300			_a165 p.
440			_aNo. 105 _vU _pS _pbureau of sport fisheries and wildlife resourc
901			_a180551
999			_c87635 _d87635