310 
of Naval Research through contract Nonr- 
3748(03). 
I am particularly indebted to D. C. Cox, 
W. M. Adams, and G. P. Woollard for their 
advice and constructive criticism. 
I would also like to acknowledge with appre- 
ciation the advice, comments, and suggestions 
given to me by A. S. Furumoto, K. Kajiura, 
G. W. Groves, H. G. Loomis, G. R. Miller, 
and Robert Harvey. 
I also thank the members of the United 
States-Japan Cooperative Field Survey (E. Berg, 
D. C. Cox, A. S. Furumoto, K. Kajiura, H. Ka- 
wasumi, and E. Shima) for permission to use 
data from their report prior to publication. 
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