A rack formed by a window-like framework is adapted to support various holders for organizing articles in a cabinet and is adapted to be pulled from a stored position in the cabinet to an accessible position in which substantially the entire rack is disposed completely outside the cabinet. The rack is carried by a bottom-supported mounting assembly having pivoted arms which collapse toward one another as the rack is moved inwardly to its stored position and expand away from one another to form a double-triangular bracing structure as the rack is pulled outwardly to its accessible position. The arms coact with guide rollers on the bottom of the cabinet to hold the rack stable in each of its positions without need of any top support for the rack. One of the holders which is supported by the rack is a wire-grid book shelf equipped with an adjustable bookend which is held by the grids of the shelf.