http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Public agricultural research spending and future U.S. agricultural productivity growth
1 online resource (6 pages) : color illustrations
Paul Heisey ; Sun Ling Wang ; and Keith Fuglie.
Title from title screen (viewed July 24, 2012).
Includes bibliographical references (page 6).
Economic brief (United States. Department of Agriculture. Economic Research Service) ; no. 17