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050 4 QH 77 B9 B6
245 00 Biodiversity of the Srebarna Biosphere Reserve :
|bchecklist and bibliography /|cedited by T. Michev ...
[et al.].
260 Sofia :|bPennsoft,|c1998.
300 130p.
650 0 Conservation|xEnvironment.
700 1 Michev, T.
|