1. Maps C.21.f.12(68) Reference (shelfmark): Maps C.21.f.12(68) Title: Machinery Hall, N. Avenue [Philadelphia Centennial Exposition]. Photographer: Unknown Scope & Content: Genre: Architectural Photography View looking along the hall, with machinery exhibits on display. Stereo half, arched top. Collection Area: Map Collections Languages: Not applicable Date Range: 1876 Extent: 1 item