Reference Library - Gum Analysis
Poslusny, M., and Daugherty, K.E. | "A Novel Approach to Looking at Stamps", The American Philatelist, Vol. 104, No. 8, August 1990, pp. 722-726. |
Hanneman, W., and Hintze, R. | "Gum Characterization by Infrared Spectroscopy", The American Philatelist, Vol. 105, No. 9, September 1991, pp. 816-817. |