
Mercer serves as the regional hub in this 1911 survey, where the Pennsylvania RR and Bessemer and Lake Erie RR intersect amidst a landscape of small agricultural and industrial hamlets. The map reveals a high density of rural infrastructure, from the State Normal School in the southeast to the State Hospital north of the county seat. The economy of the era is clearly visible through numerous family-named operations like Courtney Mills, Doughertys Mills, and the Number Five Mine near London.
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