http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f4-subject=Postmarks -- United States -- Specimens) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f4-subject%3DPostmarks%20--%20United%20States%20--%20Specimens Results for your query: docsPerPage=100;f4-subject=Postmarks -- United States -- Specimens Thu, 01 Jan 1970 12:00:00 GMT [Civil War covers, patriotic envelopes and stationery in the collection of the Western Reserve Historical Society]. Western Reserve Historical Society Library. 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 [David S. Clark collection of Civil War envelopes and covers in the library of the Western Reserve Historical Society]. Clark, David S., Western Reserve Historical Society Library. 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