Quality of crown condition data

Dobbertin M, Landmann G, Pierrat JC & Müller-Edzards C
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Dobbertin, M., Landmann, G., Pierrat, J. C., & Müller-Edzards, C. (1997). Quality of crown condition data. In C. Müller-Edzards, W. De Vries, & J. Erisman (Eds.), Ten Years of Monitoring Forest Condition in Europe. Studies on Temporal Development, Spatial Distribution and Impacts of Natural and Anthropogenic Stress Factors. Technical Background Report (pp. 7-22). EC-UN/ECE.