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ABRAMOV, I. I. (ed.): Handbook of the Lichens of the USSR. Volume 4: Kopaczevskaja, E. G., M. F. Makarevicz and A. N. Oxner, Verrucariaceae- Pilocarpaceae. 1977. 270 figs. 343 p. gr8vo. Cloth. In Russian with Latin species index and nomenclature. (663) 42.80
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