SMITHSONIAN EXPLORATIONS, 1 93 1 



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Fig. 27. — Dr. A. Opik (at right) and the writer at the mouth of a drainage 

 tunnel belonging to the uncompleted Russian fortifications about Tallinn, 

 Esthonia. The rock is the famous Obolus sandstone. 



Fig. 28. — View across Doctor Cobbold's garden to the Caradoc range. 

 Overhanging branches of the cedar of Lebanon. 

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