http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f82-subject=Coal mines and mining -- Safety measures) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f82-subject%3DCoal%20mines%20and%20mining%20--%20Safety%20measures Results for your query: docsPerPage=100;f82-subject=Coal mines and mining -- Safety measures Thu, 01 Jan 1970 12:00:00 GMT Testimony of John L. Lewis before the House of Representatives subcommittee on miners' welfare of the Committee on Education and Labor, April 3, 1947 and subcommittee of the Senate Committee on Public Lands to investigate the Centralia mine explosion, April 17, 1947. United States Congress. House. Committee on Education and Labor., Lewis, John Llewellyn, 1880-1969, United States Congress. Senate. Committee on Public Lands. 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