Rand Report- Innovative Mine Detection Systems: Scroll to pages 15-26 for <u>Explosive Vapor Detection Techniques</u>. <A HREF="http://www.rand.org/pubs/monograph_reports/MR1608/MR1608.ch2.pdf" target="_blank">http://www.rand.org/pubs/monograph_reports/MR1608/MR1608.ch2.pdf</A>