U. S. GEOLOGICAL SURVEY MONOGRAPH XV PLATE LX 
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fo 
Aes DY 
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p Es 
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BRS Y 
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Set Aye 
SUS eerie 
VIA IS VIR 
ghee 
a 
SS 
OD og 
VOW Mra 
22 ow SUG Zh yy 
1\= G 
AS 
Sana Sa 
Oar 
YA GEGS 
