International Conference on Lichen Conservation Biology, Licons. 30.8.-3.9.1999, Birmensdorf. Abstracts
Swiss Federal Institute for Forest, Snow and Landscape Research (Ed.). (1999). International Conference on Lichen Conservation Biology, Licons. 30.8.-3.9.1999, Birmensdorf. Abstracts. Swiss Federal Institute for Forest, Snow and Landscape Research.