http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f277-subject=Air mail service) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f277-subject%3DAir%20mail%20service Results for your query: docsPerPage=100;f277-subject=Air mail service Thu, 01 Jan 1970 12:00:00 GMT The first official air mail. Wetherill, Richard B. 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 Air mail. Monk, F. V. (Frank Vivian), 1886-, Winter, H. T. (Henry Thomas), 1886- 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 The standard airpost catalogue. Berkshire Exchange (New York) 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