http://netvouz.com/patfale/tag/slate?feed=rss patfale's bookmarks tagged "slate" on Netvouz http://www.escsi.org/ ESCSI, The Expanded, Shale, Clay and Slate Institute is a trade association for manufacturers of structural lightweight aggregate that is used in lightweight concrete, low density concrete, lightweight concrete masonry, lightweight chip seal and lightweight fill patfale Fri, 27 Apr 2007 00:00:13 GMT