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1866 No.IX. Map of part of the Isthmus of Dar … Survey Book No.IX. Map of part of the Isthmus of Dar … |
1866 No.XI. General sketch of the survey for … Survey Book No.XI. General sketch of the survey for … |
1866 No.XII. Interoceanic ship canal via Atra … Survey Book No.XII. Interoceanic ship canal via Atra … |
1866 No.XIII. Isthmus of Darien from 77(degre … Survey Book No.XIII. Isthmus of Darien from 77(degre … |