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lab recording, 16/8/1991, 23°C (Sony WM-D3 and QMC Mini bat detector at 30 kHz, tape: UX-Pro60, tape no. SO2/91:365-410) lab recording, 16/8/1991, 23°C (Kenwood KX880HX with AKG D202, tape: S-MES90, tape no. KW45:34.30-38.30, microphone filter below 100 Hz) |