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Boyer, T. P. and S. Levitus, Quality control and processing of historical temperature, salinity and oxygen data. NOAA Technical Report NESDIS 81:65, 1994.

Del Grosso, V.A., 1974.  New Equation for the Speed of Sound in Natural Waters (with comparison to other equations).  J.Acoust. Soc. Am., 56, 1084-1091.

Del Grosso, V.A., and C.W.Mader, 1972.   Speed of Sound in Pure Water.  J.Acoust. Soc. Am., 52, 1442-1446.

Levitus, S., T.P.Boyer, M.E. Conkright, T. O'Brien, J. Antonov, C. Stephens, L. Stathoplos, D.        Johnson, and R. Gelfeld , 1998. World Ocean Database 1998 Volume 1: Introduction, NOAA Atlas NESDIS 18, U.S. Government Printing Office,  Washington, D.C., 346 pp.