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lab recording, 16/8/1990, 26°C (Sony WM-D3 and QMC Mini bat detector at 30 kHz, tape: UX-Pro60, tape no. YU6/90:315-341?) lab recording, 16/8/1990, 26°C (Kenwood KX880HX with AKG D202, tape: S-MES90, tape no. KW31:37.30-40.30, microphone filter below 100 Hz) |