April 1977	VOLUME 2	NUMBER 2	IJOEDY	(ISSN 0364-9059)

NONTECHNICAL CONTENT
		Front cover and table of contents
		Back cover
PAPERS
James R. Wait		Propagation of ELF electromagnetic waves and project sanguine/seafarer		161
Per Gloersen and Frank T. Barath		A scanning multichannel microwave radiometer for Nimbus-G and SeaSat-A		172
Carl S. Mathews, Eric J. Isbister, and Joseph J. Fee		Marine radar interrogator-transponder		179
Rudolf Pepelnik, Hans-Ulrich Fanger, and Walfried Michaelis		Nuclear measuring techniques in mining and processing of manganese nodules		185
Jack Kritz		Parametric array Doppler sonar		190
William L. Grantham, Emedio M. Bracalente, W. Linwood Jones, and James W. Johnson		The SeaSat-A satellite scatterometer		200