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Charleston Harbor and its approaches

1. Charleston Harbor and its approaches

Sketch A, showing the primary triangulation in section I and the connection of the baselines in sections I and II

2. Sketch A, showing the primary triangulation in section I and the connection of the baselines in sections I and II

Sketch A showing the progress of the survey in Section No. 1 from 1844 to 1854

3. Sketch A showing the progress of the survey in Section No. 1 from 1844 to 1854

Sketch showing the progress of the survey on the Atlantic, Gulf of Mexico, and Pacific coast of the United States

4. Sketch showing the progress of the survey on the Atlantic, Gulf of Mexico, and Pacific coast of the United States