• NSF, 2008-2011, Agents of Change in Agriculture and the Environment: Land-User Interactions and Spatial Externalities in Organic Farming (Upper Midwest, USA) and Agrobiodiversity Production (Bolivia)

• "Targeting Incentives to Reduce Habitat Fragmentation"

Lewis DJ, Plantinga AJ, Wu JJ. American JOurnal of Agricultural Economics 91(4): 1080-1096 November 2009. This article develops a theoretical model to analyze the spatial targeting of incentives for the restoration of forested landscapes when wildlife habitat can be enhanced by reducing fragmentation.

• "The Effects of Aquatic Invasive Species on Property Values: Evidence from a Quasi-Experiment"

Horsch EJ, Lewis DJ. Land Economics 85(3): 391-409 August 2009.This study uses hedonic analysis to estimate the effects of a common aquatic invasive species-Eurasian watermilfoil (milfoil)-on property values across an extensive system of over 170 lakes in the northern forest region of Wisconsin.

• "Policies for Habit Fragmentation: Combining Econometrics with GIS-based Landscape Simulations"

Lewis DJ, Plantinga AJ, Land Economics 83 (2): 109-127 May 2007. The authors find the costs of reducing fragmentation vary greatly with initial landscape conditions and that a simple uniform subsidy performs well relative to a more complicated spatially targeted policy.

• "Is Forest Fragmentation Driven by the Spatial Configuration of Land Quality? The Case of Western Oregon"