Abstract: This invention relates to a readily assembleable and adjustable shelving system. Briefly, it comprises vertical corner support posts; paired separable bracket members adapted to inter-engage about a respective support post to form a corner sleeve assembly; and a shelf provided with corner retainers bearing a recess revealing an inner surface complimentary of approxmately one-half of the circumference of a sleeve assembly. The posts and sleeve assemblies are adjustably positioned through a locking means comprising a coupled protrusion and depression provided on their contiguously abutting surfaces; while the shelf corner retainers and sleeve assemblies are secured through substantially longitudinal sets of extending ribs and recessed grooves wedgingly meshed on their contiguously abutting surfaces. Through this construction and alignment of elements, downward forces on the shelf are redirected radially inward through the assembly towards each respective support post so as to stabilize the shelf assembly.