1. Maps C.21.f.12(64) Reference (shelfmark): Maps C.21.f.12(64) Title: Machinery Hall [Philadelphia Centennial Exposition]. Photographer: Unknown Scope & Content: Genre: Architectural Photography General view, looking along a railway line towards the Machinery Hall. Stereo half, arched top. Collection Area: Map Collections Languages: Not applicable Date Range: 1876 Extent: 1 item