https://philadelphiaencyclopedia.org/

The Encyclopedia of Greater Philadelphia centers Philadelphia as a city and community in historical and future contexts. The Encyclopedia includes archival materials as well as academic and journalistic writing, with the goal of making academic work and research available to the general public. The collections, which span 800 BCE to the present day, are organized by contents, themes, maps, timelines, and artifacts. The digital encyclopedia also includes a blog section.