Reference Library - Environmental Effects on Philatelic Materials
| Herendeen, D.L. | "To Scan or Not to Scan...", The Collectors Club Philatelist, 90(3), May-June 2011, pp. 175-178. |
| Herendeen, D.L. | "To Scan or Not to Scan...", The Collectors Club Philatelist, 90(3), May-June 2011, pp. 175-178. |