| Roofing Asphalt Proficiency Sample Program Underway |
来源：ENR 发布日期：2007-5-23
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| The Asphalt Institute is actively soliciting interest for participation in the 2007 proficiency sample program for roofing asphalts. Details on the 2007 program and an application for participation can be found on the AI website. Also available on the site are past reports from the 2005 and 2006 programs. Proficiency samples are expected to be shipped to the program participants in May. |
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