苏伦有一份最有趣的关于集邮者和邮商的档案材料。他有不同时期过手的邮品的照片,还有对比照片,无疑是同一种邮品的,也许是直边改有齿,或销伪戳,或加贴了其它邮票的封。他有刊物上的那些广告的照片,当然都是些容易引起误解的广告,那些做广告的邮商后来会对他们表达上的失误而后悔的。“随手可找来,”他盘算着,“如果什么时候我想从谁那里找什么东西他又不愿配合的话。” Sulun has one of the most interesting dossiers on stamp collectors and merchants. He has pictures of the philatelic products handed over from different periods, as well as contrasting pictures, no doubt of the same philatelic products, perhaps with straight edges modified with toothed or pinned stamps or with affixes of other stamps. He had photos of the ads on the publications, which of course were misleading advertisements that advertisers later regretted for their mistakes. “It’s easy to find it,” he said, “if he does not want to work with whom I want to look for from time to time.”