Maps and Blueprints
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Cross-section of the Canal Zone showing geological features. Image source: "Generlized Section Canal Zone Formations." Panama Canal Collection, 1846-1923 (bulk 1906-1914), by Aurin Bugbee Nichols. Vol. 46 Suppl., pt. 2, sec. 15-a [key].
Map of the Atlantic entrance to the Canal. Image source: Nichols, Aurin Bugbee, and Tirzah Lamson Nichols. Panama Canal Collection, 1846-1923 (bulk 1906-1914). Vol. 46, Nov. 1910, p. 65.
Geological map of Culebra and vicinity from 1911 showing probable limits of sliding ground. Image source: "Geological Map of Culebra and Vicinity." Panama Canal Collection, 1846-1923 (bulk 1906-1914), by Aurin Bugbee Nichols. Fol. T, sec. 19-2.
Topography of Culebra Cut in 1917 showing slide areas. Image source: "Topography East & West Culebra and Cucaracha Slides." Panama Canal Collection, 1846-1923 (bulk 1906-1914), by Aurin Bugbee Nichols. Fol. M, sec. 14.