42 
REFERENCES (Continued) 
8. Patterson, B. and Hamilton, G. R., ''Repetitive 
20 Cycle Per Second Biological Hydroacoustic Signals at 
Bermuda," p. 125-145 in Symposium on Marine Bio- 
Acoustics, Lerner Marine Laboratory, 1963, Marine Bio- 
Acoustics, Macmillan, 1964 
9, Schevill, W. E. and others, ''The 20-Cycle Signals and 
Balaenoptera (Fin Whales),'' p. 147-152 in Symposium on 
Marine Bio-Acoustics, Lerner Marine Laboratory, 1963, 
Marine Bio-Acoustics, Macmillan, 1964 
10. Bell Telephone Laboratories Contract NObsr-81018; 
Final Report, Ocean Noise Study, CONFIDENTIAL, 
December 1960 
11. Guilford, J. P., Fundamental Statistics in Psychology 
and Education, p. 23, McGraw-Hill, 1942 
12) DeVries, Aw i. and Wohischiag) Dy Es, _Divine 
Depths of the Weddell Seal,'' Science, v. 145, p. 292, 
17 July 1964 
13. Scientists Go Under Ice to Eavesdrop on Seals, San 
Diego Union, p. A-30, 13 December 1964 
14. Schusterman, R. J. and others, ''Underwater Visual 
Discrimination by the California Sea Lion,'' Science, 
v. 147, p. 1594-1596, 26) March 960 
