Jun, You might try: RG Lym and Nelson, JA. 2000. "Biological Control of Leafy Spurge (Euphorbia esula) with Apthona spp. along Railroad Right-of-Ways". Weed Technology 14:642-646. or A. Silveri et al. 2001. "Logging and edaphic factors in the invasion of an Asian woody vine in a mesic North American forest." Biological Invasions 3: 379-389. [addresses old logging roads] or Johnston, Frances Mary, Johnston, Stuart William. 2004: Impacts of Road Disturbance on Soil Properties and on Exotic Plant Occurrence in Subalpine Areas of the Australian Alps. Arctic, Antarctic, and Alpine Research: Vol. 36, No. 2, pp. 201207. Kristen Kristen Kordecki Researcher Chicago Botanic Garden 1000 Lake Cook Road Glencoe, IL 60022
--------------------------------- Yahoo! FareChase - Search multiple travel sites in one click.