A row of four vertical books, three straight and one tilted, seen from the side.

Row Of Four Books 

A line of stacked books, with one leaning diagonally in the center.

Line Of Books

Three books of different sizes stacked horizontally.

A row of stored books, binders or archives.

Three organized file books or binders, seen from the side.

Books arranged next to one another in order of size.

Three books stacked vertically, seen from the side.