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1
Map showing canal zone, location, and auxiliary structures of the Isthmian Canal
Veröffentlicht 1909“… USA Isthmian Canal Commission …”
Karte -
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Annual report of the Isthmian Canal Commission and the Panama Canal for the fiscal year ended June 30, ..
Veröffentlicht 1906“… USA Isthmian Canal Commission …”
Zeitschrift -
3