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In Memoriam
| In memory of Wilhelm JORDAN | |
| Editorial Board | 81 |
Research Papers
| Quasi-nonlinear distortion of signals in closed space for an unsteady state | |
| Stefan CZARNECKI, Władysław WYGAŃSKI | 83-106 |
| Propagation of noise generated by single moving sources in open area | |
| J. JARZĘCKI, R. MAKAREWICZ | 107-118 |
| Investigation of the waveguide properties of a borehole and their use for acoustic measurements in situ | |
| Anna JAROSZEWSKA | 119-142 |
| On the diffraction of sound wave by a wedge | |
| Roman WYRZYKOWSKI, Jan K. SNAKOWSKI | 143-154 |
| The analysis of surface wave propagation in a crystal with a monoclinic structure | |
| Lidia OPILSKA, Janusz ŚWIDER | 155-162 |
| Acoustical relaxation in heterocyclic liquids | |
| Bogumił LINDE | 163-170 |