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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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The eternal external threat  [1986]

Janzen, D.H.;

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书目信息

语言:
English
自何时收录于AGRIS:
1988
出版者:
Sinauer Associates
所有题名:
"The eternal external threat"@eng
其它:
"Conservation biology : the science of scarcity and diversity, Soule, M.E. (ed.).- Sunderland, Mass. (USA): Sinauer Associates, 1986.- ISBN 08-789-37943. p. 286-303"
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书目信息

语言:
English
自何时收录于AGRIS:
1988
出版者:
Sinauer Associates
所有题名:
"The eternal external threat"@eng
其它:
"Conservation biology : the science of scarcity and diversity, Soule, M.E. (ed.).- Sunderland, Mass. (USA): Sinauer Associates, 1986.- ISBN 08-789-37943. p. 286-303"