Media type: E-Article Title: The Productivity Effects of Extension Appointments in Land-Grant Colleges Contributor: Foltz, Jeremy D.; Barham, Bradford L. Published: Oxford University Press (OUP), 2009 Published in: Review of Agricultural Economics, 31 (2009) 4, Seite 712-733 Language: English DOI: 10.1111/j.1467-9353.2009.01463.x ISSN: 1058-7195; 1467-9353 Keywords: Economics and Econometrics ; Agronomy and Crop Science Origination: Footnote: