Comparative Grade Profiles blueprint: several railroads in WV and Maryland, undated, Case: Map case. Stephen B. Elkins Papers, A&M 0053. West Virginia and Regional History Center.
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Comparative Grade Profiles blueprint: several railroads in WV and Maryland, undated, Case: Map case. Stephen B. Elkins Papers, A&M 0053. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/23439 Accessed December 08, 2025.