Stacking Shelf Oak Additional - 2 Tiers

West Elm

Mid-Century Modular Set - Storage Wall Desk & Storage Bookshelf

Furinno

Turn-N-Tube 4-Tier Multipurpose Shelf

Wayfair

Geometric Bookcase

Homedepot

Brown 4-Shelf Ladder Bookcase

Pottery Barn Kids

Madison 4-Shelf Bookrack

Crate & Barrel

Pilsen Bookcase with Walnut Shelves(multiple options)

Crate & Barrel

Tate Walnut Storage Bookshelf

Crate & Barrel

Emmer Oak Bookcase(2options)