C. Cool and A. N. Koopmans 
41 
Num- 
ber of 
plants 
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1 " 1 
Total 
number 
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1 
1 
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1 1 1 
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lO 
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00 
1 i 1 1 1 1 1 1 1 1 
CO 
ibels with 
; 18 \ 19 
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