At Library of Congress, changes are afoot in technology as well as in physical space

The Library of Congress no longer needs the computer room that visitors once used to search its electronic card catalogue. These days the entire library has a wireless Internet connection, so workers this summer put a collection of old microfilm machines in that room instead.

Meanwhile, the library’s old-school physical catalogues, the kind filled with carefully penned index cards, have long since been relegated to cool basement hallways where schoolchildren marvel at their obscurity.

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