Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

The book Advances in Computer Science and Engineering constitutes the revised selection of 23 chapters written by scientists and researchers from all over the world. The chapters cover topics in the scientific fields of Applied Computing Techniques, Innovations in Mechanical Engineering, Electrical Engineering and Applications and Advances in Applied Modeling.

February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index.

Auditory Physiology and Perception documents the proceedings of the 9th International Symposium on Hearing held in Careens, France, 9-14 June 1991. The aim of the symposium was to promote exchanges between hearing scientists working with different approaches from cell biology to psychology. The volume is organized into 10 parts. Part I contains papers on the biology of inner ear cells. Part II presents studies on auditory periphery functioning. Part III examines frequency selectivity while Part IV contains papers that deal with the subject of pitch. The papers in Part V examine the coding of intensity. Parts VI and VII discuss temporal analyses and spectral shape analysis, respectively. Part VIII takes up spectro-temporal processing. Part IX covers binaural interactions and sound localization. The studies in Part X focus on pathologies, such as the relations between evoked otoacoustic emissions and pure tone audiometry and the effect of short duration acoustic trauma on activity of single neurons in the ventral cochlear nucleus. The final chapter of the text is a tribute to Professor Zwicker, a leading scientist in hearing, who passed away some months before the symposium.

Motion, force and energy - Vibrating systems - Sound waves - Perception and measurement of sound - Acoustics of musical instruments - Human voice - Electrical production of sound - Acoustics of rooms - Electronic music - Environmental noise Digital computers and musical sound.