You won’t find a whole lot of people who get excited about book classification. But when it comes to numbers stuck to the spine of a library book, Kathy Erickson’s face positively lights up.

“This is so cool!” she says of the Bauerliches Stricken series, a three-volume set whose components, until recently, were in two  different places on the Textile Center library shelves. These three unassuming-looking books by Lisl Fanderl, who has been called “the  Barbara Walker of Bavaria,” contain a wealth of German knitting- stitch patterns, all with charts. Now that they are all under the same classification number, they’re lined up together on the shelf.  Furthermore, a note in the library-catalog record means that all  three books will turn up under a keyword search for “patterns for knitting.”