1.		Outdoor recreation and the predictive validity of environmental attitudes / Michael A. Tarrant, Gary T. Green Autor: Tarrant, Michael A. Coautor: ; Green, Gary T.
2.		Estimating the impact of impaired visibility on the demand for visits to national parks / Neelam C. Poudyal, Bamadev Paudel, Gary T. Green Autor: Poudyal, Neelam C. Coautor: ; Paudel, Bamadev Green, Gary T.