Page:The National geographic magazine, volume 1.djvu/244

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Fig. 1. Part of Topographic Map of Pennsylvania, by J. P. Lesley (1871).
Fig. 1. Part of Topographic Map of Pennsylvania, by J. P. Lesley (1871).

Fig. 1. Part of Topographic Map of Pennsylvania, by J. P. Lesley (1871).

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