Changes in the net export of mallard from western Canada and the contiguous US, 1972-82 / by F.G. Cooch and H. Boyd.: CW69-9/142E-PDF
"Surveys by the USFWS/CWS show that the number of Mallard in May in the main production areas of the US and western Canada has dropped from 10.4 million in 1970 to 7.1 million in 1983"--Abstract.
Permanent link to this Catalogue record:
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| Department/Agency | Canada. Environment Canada. Canadian Wildlife Service. |
|---|---|
| Title | Changes in the net export of mallard from western Canada and the contiguous US, 1972-82 / by F.G. Cooch and H. Boyd. |
| Series title | Progress notes ; no. 142 |
| Publication type | Series - View Master Record |
| Language | [English] |
| Other language editions | [French] |
| Format | Electronic |
| Electronic document | |
| Note(s) | "February 1984." Digitized edition from print [produced by Environment and Climate Change Canada]. Issued also in French under title: Variations de l'exportation nette de canards malards de l'ouest du Canada et des états américains voisins, de 1972 à 1982. Includes bibliographical references. |
| Publishing information | [Ottawa] : Canadian Wildlife Service, 1984. |
| Author / Contributor | Cooch, F. G. Boyd, H. |
| Description | 27 p. : charts |
| Catalogue number |
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| Subject terms | Aquatic birds Population distribution Mallards |
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