Carson and Hanemann break into the RePEc top 10:
Carson, Richard T. & Hanemann, W. Michael, 2006. "Contingent Valuation," Handbook of Environmental Economics, in: K. G. Mäler & J. R. Vincent (ed.), Handbook of Environmental Economics, edition 1, volume 2, chapter 17, pages 821-936 Elsevier.
Earlier this month this paper was citation-ranked #17 among all RePEc papers. As of today, it has moved up to #9. This is a ginormous leap! I wonder what caused it? ... other than a mention at www.env-econ.net on January 3.