00000nam 2200000za 4500 9.850296 CaOODSP 20241203113641 cr ||||||||||| 180118s1989 oncd||||o f000 0 eng d CaOODSP eng n-cn--- CW69-9/186E-PDF Dickson, Kathryn Marie. Trends in sizes of breeding duck populations in western Canada, 1955-89 [electronic resource] / K.M. Dickson. [Ottawa] : Canadian Wildlife Service, 1989. 9 p. : charts. Progress notes ; no. 186 Issued also in French under title: Tendances des effectifs de canards nichant dans l'ouest du Canada, 1955-1989. "December 1989." Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "Changes in the sizes of duck populations have been monitored annually since 1955 over nearly 3.6 million square kilometres of breeding habitat in Montana and North and South Dakota in the United States, the western Canadian Prairie provinces, the Mackenzie Valley of the Northwest Territories, and parts of Alaska"--Introd. gccst Birds gccst Population Ducks Canada. Environment Canada. Canadian Wildlife Service. Tendances des effectifs de canards nichant dans l'ouest du Canada, 1955-1989 (CaOODSP)9.860762 Progress notes (Canadian Wildlife Service) no. 186 (CaOODSP)9.504439 PDF 338 KB https://publications.gc.ca/collections/collection_2018/eccc/CW69-9-186-eng.pdf