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A DEVICE FOR OBSERVING WILD BEAVERS IN THEIR LODGEPATENAUDE PILOTE F; OERTLI EF; BOVET J et al.1980; CANAD. J. ZOOL.; CAN; DA. 1980; VOL. 58; NO 6; PP. 1210-1212; ABS. FRE; BIBL. 8 REF.Article