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补救0个来源，并将1个来源标记为失效。 #IABot (v2.0beta9) |
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* [http://www.piccard-online.de/struktur.php?anzeigeKlassi=&klassi=&sprache=en Piccard online (English)]
* [http://www.wm-portal.net/niki/index.php Watermark Database of the Dutch University Institute for Art History]
* [https://web.archive.org/web/20170806003757/http://www.memoryofpaper.eu:8080/BernsteinPortal/appl_start.disp Bernstein The Memory of Paper, Watermark Database]
* [http://www.watermarks.info/catalogi.htm Watermarks 1850-date]
* [http://www.hobbizine.com/page0023.html ''Finding Watermarks on Stamps'']: Hobbizine article
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