
In the age of the Internet, online library catalogs and now social media very few of us can remember the days when libraries used card catalogs as the sole means of organizing and accessing information. The “digital library” has begun to replace the library of borrowing slips and index cards, but that doesn’t mean that those index cards and card catalogs still can’t have a place in today’s modern repositories. One such collection of invaluable index cards can be found at the American Philatelic Research Library (APRL), the collection known as the Piper Philatelic Index (PPI) or the Piper File for short.
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