14 



BULLETIN 670, U. S. DEPARTMENT OF AGRICULTURE. 



Ce- 

 ment- 

 ing 

 value. 



C ) 





3 S 

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to 





o 



French 

 coef- 

 ficient 

 of wear. 



00 



Ph o 



2 





Absorp- 

 tion, 



pounds 



per cubic 



foot. 





Weight 



per 



cubic 



foot. 



00 



to 



Crushing 



strength, 



pounds 



per square 



inch. 



2 



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 a 



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a 



c 

 c 



1 



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i 



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c 





o 

 o 



c 



£ 

 2 





Serial 

 No. 



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