Answer:

spines

AnswerCrossword Clue
SPINESThings seen on a bookshelf
SPINESQuills
SPINESCactus features
SPINESFeatures of hedgehogs
SPINESBookcase lineup
SPINESPlaces for book titles
SPINESLibrary patrons read them
SPINESVertebral columns
SPINESPorcupine quills
SPINESBackbones
SPINESBook parts
SPINESEchidna features
SPINESPlaces for titles