http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f5-subject=Pennsylvania -- Census, 1940) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f5-subject%3DPennsylvania%20--%20Census,%201940 Results for your query: docsPerPage=100;f5-subject=Pennsylvania -- Census, 1940 Thu, 01 Jan 1970 12:00:00 GMT Population: [Pennsylvania]. United States Bureau of the Census. https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT