July 1991	VOLUME 16	NUMBER 3	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
PAPERS
Roger F. Dwyer		Range and Doppler information from fourth-order spectra		233
Dale L. Schuler, William C. Keller, and William J. Plant		A three-frequency scatterometer technique for the measurement of ocean wave spectra		244
Stephen F. Barstow, Gard Ueland, Harald E. Krogstad, and Bjorn A. Fossum		The Wavescan second generation directional wave buoy		254
Carlo M. Ferla and Michael B. Porter		Receiver depth selection for passive sonar systems		267
Vahid Hesany, Richard K. Moore, S. Prasad Gogineni, and Julian C. Holtzman		Slope-induced nonlinearities on imaging of ocean waves		279
William M. Carey and William B. Moseley		Space-time processing, environmental-acoustic effects		285