VIII- 12. STRICKLAND, J. D. H. Solar radiation penetrating the ocean. 

 A review of requirements, data, and methods of measurement, 

 with particular reference to photo synthetic productivity, Jour - 

 nal of the Fisheries Research Board of Canada , vol. 15, no. 3, 

 p. 453-493, 1958. 



VHI-13. TYLER, J. E. Measurement of light in the sea, Journal of the 

 O ptical Societ y of America , vol. 45, p. 904, 1955. 



VIII- 14. WILLIAMS, JEROME. The dual-filter hydrophotometer. Chesa- 

 peake Bay Institute. Technical Report No. 5, p. 53-58, 1953. 



VIII- 15. WILLIAMS, JEROME. The tri- filter hydrophotometer. Chesa- 

 peake Bay Institute. Technical Report No. 9. Reference 55-4. 

 14 p. June 1955. 



VIII- 1 



