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For medieval history, see WILLIAM URBAN, The Baltic Crusade (1975), and The Livonian Crusade (1981); and ERIC CHRISTIANSEN, The Northern Crusades: The Baltic and the Catholic Frontier, 1100-1525 (1980).
The Marxist Philosophy
Callicott, J B, Crowder, L B & Mumford, K (1999) Current normantive concepts in conservation. Conservation Biology 13:22-35
‘Naturalness’ in Conservation
Wayne, Bob. "Red Wolves: To Conserve or not to Conserve." Candid News vol.3 1995.
Genetic Conservation
Angermeier, P L (2000) The natural imperative for biological conservation. Conservation Biology 14: 373-381
‘Naturalness’ in Conservation
The Game Conservancy Trust. "Black Grouse Conservation Brochure." The Game Conservancy Trust. 28 Apr. 2004. <http://www.gct.org.uk/research/blackgrouse/frameset.html>
Red and Black Grouse
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