Visualizing Chronicling America Data: 15 million pages of digitized historical newspapers | The Signal

"This week we celebrate an exciting milestone. Chronicling America, the online searchable database of historic U.S. newspapers, now includes more than 15 million pages! To mark the occasion, we are throwing a #ChronAmParty on Twitter and unveiling a set of interactive data visualizations that help reveal the variety of content available in a corpus of 15 million digitized newspaper pages...."