Smithsonian Report, 1916.— Hart: 



Plate 9. 



1. A Section of the Dalles-Celilo Canal, Columbia River, Oreg., Showing 

 Concrete Lining in the Section Through Sand. 



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2. Excavation for a Lock in the Basaltic Rock for the Dalles-Celilo Canal, 

 Columbia River, Oreg. 



