12. Naval Civil Engineering Laboratory. Technical Note N-1 072: Seal 

 systems in hydrospace, Phase III: Effects of long-term hydrospace exposure 

 on seal system integrity. 1 89 days at 5900 feet, by J. F. Jenkins and F. M. 

 Reinhart. Port Hueneme, Calif., Jan. 1970. 



13. J. Marin and Y. Pao. "On the accuracy of extrapolated creep-test 

 relations for plexiglas subjected to various stresses," American Society of 

 Mechanical Engineers, Transactions, vol. 74, Oct. 1952, pp. 1231-1240. 



14. Rohm and Haas Company. PLEXIGLAS handbook for aircraft engineers, 

 2nd ed. Philadelphia, Pa., 1952, pp. 15-16. 



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