Bas Obispo and Las Cascadas Excavation Drawings
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United States. Panama Canal Company. Engineering and Construction Bureau
http://n2t.net/ark:/99166/w6r31rp4 (corporateBody)
The Engineering and Construction Bureau, headed by an active duty colonel in the Corps of Engineers, had jurisdiction over the planning, design and supervision of all construction, most maintenance work in the Canal Zone and the supply of water and power....
