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lab recording, 20/8//1991, 22°C (Sony WM-D3 with QMC Mini bat detector at 40 kHz, tape: UX-Pro60, tape no. SO4/91:104-160) lab recording, 25/8/1991, 25°C (Kenwood KX880HX with AKG D202, tape: S-MES90, tape no. KW47:46.25-48.25, microphone filter below 100 Hz) |