subject
philadelphia (pa.): explore 1 source-linked works published from 1870 to 1870, with original documents and citations.
This collection is a preview while coverage and quality are evaluated.
Includes records with this source-supplied label or an explicit phrase match in their metadata. Matches indicate a mention, not proof that a paper uses a method or tests a material. Source versions are consolidated by DOI.
Sources: loc. Collection updated 2026-09-20. Counts describe this index, not the complete source archives.
AACR2 Perspective map not drawn to scale. Library of Congress. Panoramic maps of cities in the United States and Canada (2nd ed.), 827.2 Available also through the Library of Congress Web site as a raster image.