search query: @freeterm voluntary programs / total: 2
references: 1-2 / 2
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1.
Journal of Environmental Economics and Management
2009 : NOV, VOL. 58:3, p. 253-265
2009 Cutter, W.B.
Neidell, M.
2.
Journal of Environmental Economics and Management
2009 : MAR, VOL. 57:2, p. 166-181
2009 Brouhle, K.
Griffiths, C.
Wolverton, A.
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