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SOURCES OF MATERIALS

Supelco 595 North Harrison Rd. Bellefonte, Pa. 16823-0048 (800) 247-6628 www.sigma-aldrich.com/supelco

Agilent Technologies 2850 Centerville Rd. Wilmington, Del. 19808 (800) 227-9770 www.agilent.com/chem

NSI Solutions, Inc. 7517 Precision Dr., Suite 101 Raleigh, N.C. 27617 (800) 234-7837

AUTHOR INFORMATION

MARK ORMSBY graduated from Grinnell College, Grinnell, Iowa, with a degree in physics and received an MS in physics from the University of Maryland. Since 1990 he has worked at the National Archives and Records Administration, initially focusing on conservation applications of image processing. His current research interests include environmental monitoring, studying the role of gelatin sizing in paper degradation, and developing new applications of SPME–GC-MS. Address: National Archives and Records Administration, 8601 Adelphi Rd., Room 1800, College Park, Md. 20740–6001