13. G. A. Leibiger and D. Lee (This program has not yet been documented. 

 See reference 9 for an earlier version. ) 



14. H. Weinberg, Navy Interim Surface Ship Model (NISSM) II . NUSC Technical 

 Report 4527, 14 November 1973. 



15. H. Weinberg and R. Burridge, "Horizontal Ray Theory for Ocean Acous- 

 tics, " Journal of the Acoustical Society of America , vol. 55, no. 1, Jan- 

 uary 1974, pp. 63-79. 



16. A. D. Pierce, "Extension of the Method of Normal Modes to Sound Propa- 

 gation in an Almost-Stratified Medium, " Journal of the Acoustical Society 

 of America, vol. 37, no, 1, January 1965, pp. 19-27. 



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