Heavy-duty desk-end bookcase unit, which will fit neatly onto the end of this range of desking or will sit alone in any room as low level storage. Straight Desk-High Bookcase Desk-High Bookcase. Ideal in any school classroom, office, or storage room. Straight Bookcase has one adjustable shelf, while Quadrant Bookcase has one fixed shelf. Very robust. Bookcases come in beech or oak. Flat-packed for simple assembly.