October 1997	VOLUME 22	NUMBER 4	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
PAPERS
John N. Atanga and Lucy R. Wyatt		Comparison of inversion algorithms for HF radar wave measurements		593
Nicholas P. Chotiros, Adrienne M. Mautner, Arne Løvik, Åge Kristensen, and Oddbjorn Bergem		Acoustic penetration of a silty sand sediment in the 1-10-kHz band		604
Roman Kuc		Biomimetic sonar locates and recognizes objects		616
Bradley A. Moran, John J. Leonard, and Chryssostomos Chryssostomidis		Curved shape reconstruction using multiple hypothesis tracking		625
Henry T. Wang and Clark B. Freise		Error analysis of the directional wave spectra obtained by the NDBC 3-m pitch-roll discus buoy		639
Kainam T. Wong and Michael D. Zoltowski		Closed-form underwater acoustic direction-finding with arbitrarily spaced vector hydrophones at unknown locations		649
Kainam T. Wong and Michael D. Zoltowski		Extended-aperture underwater acoustic multisource azimuth/Elevation direction-finding using uniformly but sparsely spaced vector hydrophones		659