The Boston Public Library is beefing up security and overhauling the way it manages its valuables following the disappearance of two rare works of art worth more than $600,000 combined.

The changes were announced Wednesday by library President Amy Ryan following a special meeting of library trustees.

The plans include an expanded and accelerated inventory and assessment of special collections with a focus on the most important and valuable; the transfer of 24,000 paper catalog cards to the electronic catalog; and working with a consultant to improve security in several areas, including adding cameras and motion detectors.

A 1634 Rembrandt etching and the 1504 Durer engraving were reported missing last month. Police and the FBI are investigating, although it's not clear if the pieces were stolen or simply misfiled.