1. Lamb, H. H.: 1977,Climate; Present, Past and Future, London, Methuen, p. 234.
2. Ibid. Lamb, H. H.: 1977,Climate; Present, Past and Future, London, Methuen, p. 235.
3. Report Series Number 28;H. Blokpoel,1975
4. Ibid. Blokpoel, H.: 1975,Migration of Lesser Snow and Blue Geese in spring across southern Manitoba, Part 1, ‘Distribution, Chronology, Directions, Numbers, Heights and Speeds’, Ottawa, Canadian Wildlife Service, Report Series Number 28, p. 14.
5. Ibid. Blokpoel, H.: 1975,Migration of Lesser Snow and Blue Geese in spring across southern Manitoba, Part 1, ‘Distribution, Chronology, Directions, Numbers, Heights and Speeds’, Ottawa, Canadian Wildlife Service, Report Series Number 28, p. 14., p. 15.