EVALUATION METHOD OF AIRWORTHINESS COMPLIANCE OF CIVIL AIRCRAFT FLIGHT DECK DOOR AGAINST BULLET PENETRATION



Crop Species Diversity Changes in the United States: 1978-2012.

Anecdotal accounts regarding reduced US cropping system diversity have raised concerns about negative impacts of increasingly homogeneous cropping systems.However, formal analyses to document such changes are lacking.Using US Agriculture Census data, which are collected every five years, we quantified crop species diversity from Tweeter 1978 to 201

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