Piles or factory chimneys

• Piles of pancakes
• IHOP servings
• Storage space consisting of an extensive arrangement of bookshelves in a library where most of the books are stored
• Part of a library where the books are
• Library collections
• Arranges in piles
• Puts into piles
• Library visitors wander among them
• A large number or amount

Wiktionary Word definitions in Wiktionary
n. (plural of stack English) vb. (en-third-person singular of: stack )