3U 



plunging ic 

 corrie peril 



In cone 

 London for 

 research ; t 



ways ; to 

 criticism ai 

 his inspirii 

 tlie field, ai 

 of this rese. 



Map, sh 

 at four of t] 

 the Sperrin 



Scale : I 



Map, ill 

 the western 

 region from 

 the distribi 

 shelly drift 

 western (as 

 the re-adva 



Scale: f 



