
Mount Airy and Ridgeville serve as northern anchor points for this 1940s landscape where the borders of Frederick, Carroll, Howard, and Montgomery counties converge. The Baltimore and Ohio RR cuts through the northern section, passing by Parrsville and the industrial-sounding Plane No 4. This area represents a critical watershed divide, where the headwaters of the Patapsco River and Patuxent River begin their descent toward the Chesapeake, separated by the high ground of the Parrs Ridge.
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