198 MKSSBS. KZHKBV AND DUFF 0N m ^^ ^ 

 *fc 21-SecUon of Magnesian Limestone and Drift, Morton Tillmoutl , 



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 % Coal Compaq C£ * wT^, 1 " "" f~ 

 to make use of facts observed by „I e of £££ ""^ 

 workings of their collieries. ™dergr„and 



