Search for: [References = "25. Roo\-Zielinska E., Solon J., 1998b, Herb layer diversity and phytoindicative evaluation of habitat conditions of forest permanent plots in Poland, \[w\:\] Proceedings of the International Symposium on Air Pollution and Climate Change Effects on Forest Ecosystems, February 5–9, 1996, Riverside, California, General Technical Report, PSIO\-GTR, 164, U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, Portland, OR, s. 161–168."]

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