"SAES, USDA Intramural, and Extension Expenditures for the 48 Continguous States, 1890-2007"


Philip G. Pardey, Connie Chan-Kang and Michelle L. Hallaway


Appendix Table 6.1 in J.M. Alston, M.A. Andersen, J.S. James and P.G. Pardey. Persistence Pays - U.S. Agricultural Productivity Growth and the Benefits from Public R&D Spending. New York: Springer. 2010